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NX-ID / IA / OD / OC / MD

NX-series Digital I/O Unit

NX-ID / IA / OD / OC / MD

A wide range of digital I/O units from general purpose use to high-speed synchronous control

General Specifications

Item Specification
Enclosure Mounted in a panel
Grounding method Ground to 100 Ω or less
Operating
environment
Ambient operating temperature 0 to 55°C
Ambient operating humidity 10% to 95% (with no condensation or icing)
Atmosphere Must be free from corrosive gases.
Ambient storage temperature -25 to 70°C (with no condensation or icing)
Altitude 2,000 m max.
Pollution degree 2 or less: Conforms to JIS B3502 and IEC 61131-2.
Noise immunity 2 kV on power supply line (Conforms to IEC61000-4-4.)
Overvoltage category Category II: Conforms to JIS B3502 and IEC 61131-2.
EMC immunity level Zone B
Vibration resistance *1 Conforms to IEC 60068-2-6.
5 to 8.4 Hz with 3.5-mm amplitude, 8.4 to 150 Hz, acceleration of
9.8 m/s2, 100 min each in X, Y, and Z directions
(10 sweeps of 10 min each = 100 min total)
Shock resistance *1 Conforms to IEC 60068-2-27. 147 m/s2, 3 times each in X, Y, and
Z directions
Applicable standards *2 cULus: Listed (UL508) or Listed (UL 61010-2-201), ANSI/ISA 12.12.01,
EU: EN 61131-2 or EN 61010-2-201, C-Tick or RCM, KC: KC Registration, NK, LR

*1. For the Relay Output Unit, refer to the Digital Input Unit Specifications.
*2. Consult your OMRON representative for the most recent applicable standards for each model.

Digital Input Unit Specifications

DC Input Unit (Screwless Clamping Terminal Block, 12 mm Width)

NX-ID3317

Unit name DC Input Unit Model NX-ID3317
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_2_1
Internal I/O common NPN
Rated input voltage 12 to 24 VDC (9 to 28.8 VDC)
Input current 6 mA typical (at 24 VDC), rated current
ON voltage/ON current 9 VDC min./3 mA min. (between IOV
and each signal)
OFF voltage/OFF
current
2 VDC max./1 mA max. (between IOV
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_2_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_2_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID3343

Unit name DC Input Unit Model NX-ID3343
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_3_1
Internal I/O common NPN
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min. (between IOV
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between IOV
and each signal)
ON/OFF response
time
100 ns max./100 ns max.
Input filter time Without filter, 1 μs, 2 μs, 4 μs, 8 μs
(factory setting), 16 μs, 32 μs, 64 μs,
128 μs, 256 μs
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for 1
minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 65 g max.
Circuit layout
3185_sp_3_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_3_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID3344

Unit name DC Input Unit Model NX-ID3344
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Input refreshing with input changed time
Indicators TS indicator,
input indicator
3185_sp_4_1
Internal I/O common NPN
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min. (between IOV
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between IOV
and each signal)
ON/OFF response
time
100 ns max./100 ns max.
Input filter time No filter
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for 1
minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 65 g max.
Circuit layout
3185_sp_4_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_4_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID3417

Unit name DC Input Unit Model NX-ID3417
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_5_1
Internal I/O common PNP
Rated input voltage 12 to 24 VDC (9 to 28.8 VDC)
Input current 6 mA typical (at 24 VDC), rated current
ON voltage/ON current 9 VDC min./3 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
2 VDC max./1 mA max. (between IOG
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_5_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_5_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID3443

Unit name DC Input Unit Model NX-ID3443
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_6_1
Internal I/O common PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between IOG
and each signal)
ON/OFF response
time
100 ns max./100 ns max.
Input filter time Without filter, 1 μs, 2 μs, 4 μs, 8 μs
(factory setting),16 μs, 32 μs, 64 μs,
128 μs, 256 μs
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 65 g max.
Circuit layout
3185_sp_6_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_6_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID3444

Unit name DC Input Unit Model NX-ID3444
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Input refreshing with input changed time
Indicators TS indicator,
input indicator
3185_sp_7_1
Internal I/O common PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min.
(between IOG and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max.
(between IOG and each signal)
ON/OFF response
time
100 ns max./100 ns max.
Input filter time No filter
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.1 A/terminal max.,
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 65 g max.
Circuit layout 3185_sp_7_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_7_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID4342

Unit name DC Input Unit Model NX-ID4342
Number of points 8 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_8_1
Internal I/O common NPN
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between IOG
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_8_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_8_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID4442

Unit name DC Input Unit Model NX-ID4442
Number of points 8 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_9_1
Internal I/O common PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./3 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between IOG
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOG: 0.1 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_9_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_9_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID5342

Unit name DC Input Unit Model NX-ID5342
Number of points 16 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_10_1
Internal I/O common NPN
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./2 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
5 VDC max./0.5 mA max. (between IOG
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_10_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_10_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID5442

Unit name DC Input Unit Model NX-ID5442
Number of points 16 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_11_1
Internal I/O common PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 3.5 mA typical (at 24 VDC), rated
current
ON voltage/ON current 15 VDC min./2 mA min. (between IOG
and each signal)
OFF voltage/OFF
current
5 VDC max./0.5 mA max. (between IOG
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time Without filter, 0.25 ms, 0.5 ms, 1 ms
(factory setting), 2 ms, 4 ms, 8 ms, 16
ms, 32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
No consumption
Weight 65 g max.
Circuit layout
3185_sp_11_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_11_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

DC Input Unit (M3 Screw Terminal Block, 30 mm Width)

NX-ID5142-1

Unit name DC Input Unit Model NX-ID5142-1
Number of points 16 points External connection
terminals
M3 screw terminal block (18 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_12_1
Internal I/O common For both NPN/PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 7 mA typical (at 24 VDC)
ON voltage/ON current 15 VDC min./3 mA min. (between COM
and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max. (between COM
and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms (default),
2 ms, 4 ms, 8 ms, 16 ms, 32 ms, 64 ms,
128 ms, 256 ms
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
No consumption
Weight 125 g max.
Circuit layout 3185_sp_12_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: As shown in the following.
3185_sp_12_3
Terminal
connection diagram
3185_sp_12_4
• The polarity of the input power supply can be connected in either direction.
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

DC Input Unit (MIL Connector, 30 mm Width)

NX-ID5142-5

Unit name DC Input Unit Model NX-ID5142-5
Number of points 16 points External connection
terminals
MIL connector (20 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
input indicators
3185_sp_13_1
Internal I/O common For both NPN/PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current 7 mA typical (at 24 VDC)
ON voltage/ON current 15 VDC min./3 mA min.
(between COM and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max.
(between COM and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms, 16 ms,
32 ms, 64 ms, 128 ms, 256 ms
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
No consumption
Weight 85 g max.
Circuit layout 3185_sp_13_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: As shown in the following.
3185_sp_13_3
Terminal
connection diagram
3185_sp_13_4
• The polarity of the input power supply can be connected in either direction.
• Be sure to wire both pins 3 and 4 (COM), and set the same polarity for both pins.
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-ID6142-5

Unit name DC Input Unit Model NX-ID6142-5
Number of points 32 points External connection
terminals
MIL connector (40 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
input indicators
3185_sp_14_1
Internal I/O common For both NPN/PNP
Rated input voltage 24 VDC (19 to 28.8 VDC)
Input current 4.1 mA typical (24 VDC)
ON voltage/ON current 19 VDC min./3 mA min.
(between COM and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max.
(between COM and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms, 16 ms,
32 ms, 64 ms, 128 ms, 256 ms
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.60 W max.
Current
consumption from
I/O power supply
No consumption
Weight 90 g max.
Circuit layout 3185_sp_14_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: As shown in the following.
3185_sp_14_3
Terminal
connection diagram
3185_sp_14_4
• The polarity of the input power supply can be connected in either direction.
• Be sure to wire both pins 23 and 24 (COM0), and set the same polarity for both pins.
• Be sure to wire both pins 3 and 4 (COM1), and set the same polarity for both pins.
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

DC Input Unit (Fujitsu Connector, 30 mm Width)

NX-ID6142-6

Unit name DC Input Unit Model NX-ID6142-6
Number of points 32 points External connection
terminals
Fujitsu connector (40 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_15_1
Internal I/O common For both NPN/PNP
Rated input voltage 24 VDC (19 to 28.8 VDC)
Input current 4.1 mA typical (24 VDC)
ON voltage/ON current 19 VDC min./3 mA min.
(between COM and each signal)
OFF voltage/OFF
current
5 VDC max./1 mA max.
(between COM and each signal)
ON/OFF response
time
20 μs max./400 μs max.
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms (default),
2 ms, 4 ms, 8 ms, 16 ms, 32 ms, 64 ms,
128 ms, 256 ms
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.95 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
Current
consumption from
I/O power supply
No consumption
Weight 90 g max.
Circuit layout 3185_sp_15_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: As shown in the following.
3185_sp_15_3
Terminal
connection diagram
3185_sp_15_4
• The polarity of the input power supply can be connected in either direction.
• Be sure to wire both pins A9 and A18 (COM0), and set the same polarity for both pins.
• Be sure to wire both pins B9 and B18 (COM1), and set the same polarity for both pins.
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

AC Input Unit (Screwless Clamping Terminal Block, 12 mm Width)

NX-IA3117

Unit name AC Input Unit Model NX-IA3117
Number of points 4 points,
independent contacts
External connection
terminals
Screwless clamping terminal block (8
terminals)
Capacity Free-Run refreshing
Indicators TS indicator,
input indicator
3185_sp_16_1
Internal I/O common No polarity
Rated input voltage 200 to 240 VAC, 50/60 Hz (170 to
264 VAC, ±3 Hz)
Input current 9 mA typical (at 200 VAC, 50 Hz)
11 mA typical (at 200 VAC, 60 Hz)
ON voltage/
ON current
120 VAC min./4 mA min.
OFF voltage/
OFF current
40 VAC max./2 mA max.
ON/OFF response time 10 ms max./40 ms max.
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms, 16 ms,
32 ms, 64 ms, 128 ms, 256 ms
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
Between each AC input
circuit: 20 MΩ min. (at 500
VDC)
Between the external
terminals and the functional
ground terminal: 20 MΩ min.
(at 500 VDC)
Between the external
terminals and internal
circuits: 20 MΩ min. (at 500
VDC)
Between the internal circuit
and the functional ground
terminal: 20 MΩ min. (at 100
VDC)
Dielectric strength Between each AC input circuit:
AC3700V VAC for 1 min at a leakage
current of 5 mA max.
Between the external terminals and
functional ground terminal: 2300 VAC
for 1 min at a leakage current of 5 mA
max.
Between the external terminals and
internal circuits: 2300 VAC for 1 min
at a leakage current of 5 mA max.
Between the internal circuit and the
functional ground terminal: 510 VAC
for 1 min at a leakage current of 5 mA
max.
I/O power supply
method
Supplied from external
source.
Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.80 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
No consumption
Weight 60 g max.
Circuit layout
3185_sp_16_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_16_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

Digital Output Unit Specifications

Transistor Output Unit (Screwless Clamping Terminal Block, 12 mm Width)

NX-OD2154

Unit name Transistor Output Unit Model NX-OD2154
Number of points 2 points External connection
terminals
Screwless clamping terminal block
(8 terminals)
I/O refreshing
method
Output refreshing with specified time stamp
Indicators TS indicator,
output indicator
3185_sp_17_1
Internal I/O common NPN
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 1 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
300 ns max./300 ns max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.45 W max.
I/O current
consumption
30 mA max.
Weight 70 g max.
Circuit layout
3185_sp_17_2

This unit uses a push-pull output circuit.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_17_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD2258

Unit name Transistor Output Unit Model NX-OD2258
Number of points 2 points External connection
terminals
Screwless clamping terminal block
(8 terminals)
I/O refreshing
method
Output refreshing with specified time stamp
Indicators TS indicator,
output indicator
3185_sp_18_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 1 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
300 ns max./300 ns max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
I/O current
consumption
40 mA max.
Weight 70 g max.
Circuit layout
3185_sp_18_2

This unit uses a push-pull output circuit.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_18_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD3121

Unit name Transistor Output Unit Model NX-OD3121
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_19_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
I/O current
consumption
10 mA max.
Weight 70 g max.
Circuit layout 3185_sp_19_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_19_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD3153

Unit name Transistor Output Unit Model NX-OD3153
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_20_1
Internal I/O common NPN
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
300 ns max./300 ns max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
I/O current
consumption
30 mA max.
Weight 70 g max.
Circuit layout
3185_sp_20_2

This unit uses a push-pull output circuit.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_20_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD3256

Unit name Transistor Output Unit Model NX-OD3256
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_21_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
I/O current
consumption
20 mA max.
Weight 70 g max.
Circuit layout 3185_sp_21_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_21_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD3257

Unit name Transistor Output Unit Model NX-OD3257
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_22_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
300 ns max./300 ns max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Digital isolator isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.,
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
I/O current
consumption
40 mA max.
Weight 70 g max.
Circuit layout
3185_sp_22_2

This unit uses a push-pull output circuit.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_22_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD3268

Unit name Transistor Output Unit Model NX-OD3268
Number of points 4 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_23_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
2 A/point, 8 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
IOV: 2 A/terminal max.,
IOG: 2 A/terminal max.,
COM (+V): 4 A/terminal max.,
0V: 4 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communi-
cations Coupler Unit
0.50 W max.
Current
consumption from
I/O power supply
20 mA max.
Weight 70 g max.
Circuit layout 3185_sp_23_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_23_3

• 0V has 2 terminals, so be sure to wire both terminals.
• COM (+V) has 2 terminals, so be sure to wire both terminals.
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD4121

Unit name Transistor Output Unit Model NX-OD4121
Number of points 8 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_24_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOV: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.55 W max.
I/O current
consumption
10 mA max.
Weight 70 g max.
Circuit layout 3185_sp_24_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_24_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD4256

Unit name Transistor Output Unit Model NX-OD4256
Number of points 8 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_25_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
IOG: 0.5 A/terminal max.
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communi-
cations Coupler Unit
0.65 W max.
I/O current
consumption
30 mA max.
Weight 70 g max.
Circuit layout 3185_sp_25_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_25_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD5121

Unit name Transistor Output Unit Model NX-OD5121
Number of points 16 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_26_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communi-
cations Coupler Unit
0.65 W max.
I/O current
consumption
20 mA max.
Weight 70 g max.
Circuit layout 3185_sp_26_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_26_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD5256

Unit name Transistor Output Unit Model NX-OD5256
Number of points 16 points External connection
terminals
Screwless clamping terminal block (16
terminals)
I/O refreshing
method
Selectable Synchronous I/O refreshing or Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_27_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
15 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from the NX bus Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.10 W max.
• Connected to a Communi-
cations Coupler Unit
0.70 W max.
I/O current
consumption
40 mA max.
Weight 70 g max.
Circuit layout 3185_sp_27_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_27_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

Transistor Output Unit (M3 Screw Terminal Block, 30 mm Width)

NX-OD5121-1

Unit name Transistor Output Unit Model NX-OD5121-1
Number of points 16 points External connection
terminals
M3 screw terminal block (18 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_28_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 5 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA max.
I/O power supply
method
Supply from the external
source
Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communi-
cations Coupler Unit
0.60 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 125 g max.
Circuit layout 3185_sp_28_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_28_3
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD5256-1

Unit name Transistor Output Unit Model NX-OD5256-1
Number of points 16 points External connection
terminals
M3 screw terminal block (18 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_29_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
20.4 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 5 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.95 W max.
• Connected to a Communi-
cations Coupler Unit
0.65 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 125 g max.
Circuit layout 3185_sp_29_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_29_3
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

Transistor Output Unit (MIL Connector, 30 mm Width)

NX-OD5121-5

Unit name Transistor Output Unit Model NX-OD5121-5
Number of points 16 points External connection
terminals
MIL connector (20 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_30_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
0.95 W max.
• Connected to a Communi-
cations Coupler Unit
0.60 W max.
Current
consumption from
I/O power supply
30 mA max.
Weight 80 g max.
Circuit layout 3185_sp_30_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_30_3
• Be sure to wire both pins 3 and 4 (COM).
• Be sure to wire both pins 1 and 2 (+V).
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD5256-5

Unit name Transistor Output Unit Model NX-OD5256-5
Number of points 16 points External connection
terminals
MIL connector (20 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_31_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
20.4 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supplied from external
source.
Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communi-
cations Coupler Unit
0.70 W max.
Current
consumption from
I/O power supply
40 mA max.
Weight 85 g max.
Circuit layout 3185_sp_31_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_31_3
• Be sure to wire both pins 1 and 2 (COM (+V)).
• Be sure to wire both pins 3 and 4 (0V).
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

NX-OD6121-5

Unit name Transistor Output Unit Model NX-OD6121-5
Number of points 32 points External connection
terminals
MIL connector (40 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_32_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/common, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communi-
cations Coupler Unit
0.80 W max.
Current
consumption from
I/O power supply
50 mA max.
Weight 90 g max.
Circuit layout 3185_sp_32_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_32_3
• Be sure to wire both pins 21 and 22 (+V0).
• Be sure to wire both pins 23 and 24 (COM0).
• Be sure to wire both pins 1 and 2 (+V1).
• Be sure to wire both pins 3 and 4 (COM1).
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

NX-OD6256-5

Unit name Transistor Output Unit Model NX-OD6256-5
Number of points 32 points External connection
terminals
MIL connector (40 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_33_1
Internal I/O common PNP
Rated voltage 24 VDC
Operating load
voltage range
20.4 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/common, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.5 ms max./1.0 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA
max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.30 W max.
• Connected to a Communi-
cations Coupler Unit
1.00 W max.
Current
consumption from
I/O power supply
80 mA max.
Weight 95 g max.
Circuit layout 3185_sp_33_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_33_3
• Be sure to wire both pins 21 and 22 (COM0 (+V)).
• Be sure to wire both pins 1 and 2 (COM1 (+V)).
• Be sure to wire both pins 23 and 24 (0V0).
• Be sure to wire both pins 3 and 4 (0V1).
Disconnection/
Short-circuit
detection
Not supported. Protective function With load short-circuit protection.

Transistor Output Unit (Fujitsu Connector, 30 mm Width)

NX-OD6121-6

Unit name Transistor Output Unit Model NX-OD6121-6
Number of points 32 points External connection
terminals
Fujitsu connector (40 terminals)
I/O refreshing
method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_34_1
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load
voltage range
10.2 to 28.8 VDC
Maximum value of
load current
0.5 A/point, 2 A/common, 4 A/Unit
Maximum inrush
current
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response
time
0.1 ms max./0.8 ms max.
Dimensions 30 (W) x 100 (H) x 71 (D) Isolation method Photocoupler isolation
Insulation
resistance
20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for
1 minute at a leakage current of 5 mA max.
I/O power supply
method
Supply from external source Current capacity of
I/O power supply
terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.10 W max.
• Connected to a Communi-
cations Coupler Unit
0.80 W max.
Current
consumption from
I/O power supply
50 mA max.
Weight 90 g max.
Circuit layout 3185_sp_34_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection diagram
3185_sp_34_3

• Be sure to wire both pins A9 and A19 (COM0).
• Be sure to wire both pins B9 and B19 (COM1).
• Be sure to wire both pins A10 and A20 (+V0).
• Be sure to wire both pins B10 and B20 (+V1).
Disconnection/
Short-circuit
detection
Not supported. Protective function Not supported.

Relay Output Unit (Screwless Clamping Terminal Block, 12 mm Width)

NX-OC2633

Unit name Relay Output Units Model NX-OC2633
Number of points 2 points, independent contacts External
connection
terminals
Screwless clamping terminal block (8
terminals)
I/O refreshing
method
Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_35_1
Relay type N.O. contact
Maximum
switching capacity
250 VAC/2 A (cosφ = 1),
250 VAC/2 A (cosφ = 0.4),
24 VDC/2 A, 4 A/Unit
Minimum
switching capacity
5 VDC, 1 mA
Relay service life Electrical: 100,000 operations *
Mechanical: 20,000,000 operations
ON/OFF response
time
15 ms max./15 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Relay isolation
Insulation
resistance
Between A1/B1 terminals and A3/B3
terminals: 20 MΩ min. (500 VDC)
Between the external terminals and
internal circuits: 20 MΩ min. (500
VDC)
Between the internal circuit and GR
terminal: 20 MΩ min. (100 VDC)
Between the external terminals and
GR terminal: 20 MΩ min. (500 VDC)
Dielectric
strength
Between A1/B1 terminals and A3/B3
terminals: 2300 VAC for 1 min at a
leakage current of 5 mA max.
Between the external terminals and
GR terminal: 2300 VAC for 1 min at a
leakage current of 5 mA max.
Between the external terminals and
internal circuits: 2300 VAC for 1 min
at a leakage current of 5 mA max.
Between the internal circuit and GR
terminal: 510 VAC for 1 min at a
leakage current of 5 mA max.
Vibration
resistance
Conforms to IEC60068-2-6.
5 to 8.4 Hz with amplitude of 3.5 mm,
8.4 to 150 Hz, acceleration of 9.8
m/s2
100 min each in X, Y, and Z
directions
(10 sweeps of 10 min each = 100 min
total)
Shock resistance 100 m/s2, 3 times each in X, Y, and
Z directions
I/O power supply
method
Supply from external source Current capacity
of I/O power
supply terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.20 W max.
• Connected to a Communications
Coupler Unit
0.80 W max.
I/O current
consumption
No consumption
Weight 65 g max.
Circuit layout
3185_sp_35_2

You cannot replace the relay.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection
diagram
3185_sp_35_3
Disconnection/
Short-circuit
detection
Not supported. Protective
function
Not supported.

* Electrical service life will vary depending on the current value. Refer to "NX-series Digital I/O Units User’s Manual" for details.

NX-OC2733

Unit name Relay Output Unit Model NX-OC2733
Number of points 2 points, independent contacts External
connection
terminals
Screwless clamping terminal block (8
terminals)
I/O refreshing
method
Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_36_1
Maximum
switching capacity
250 VAC/2 A (cosφ = 1),
250 VAC/2 A (cosφ = 0.4),
24 VDC/2 A,
4 A/Unit
Minimum
switching capacity
5 VDC, 10 mA
Relay service life Electrical: 100,000 operations
Mechanical: 20,000,000 operations
ON/OFF response
time
15 ms max./15 ms max.
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Relay isolation
Insulation
resistance
Between A1/3, B1/3 terminals and
A5/7, B5/7 terminals: 20 MΩ min.
(at 500 VDC)
Between the external terminals and
functional ground terminal: 20 MΩ
min. (at 500 VDC)
Between the external terminals and
internal circuits: 20 MΩ min. (at 500
VDC)
Between the internal circuit and the
functional ground terminal: 20 MΩ
min. (at 100 VDC)
Dielectric
strength
Between A1/3, B1/3 terminals and
A5/7, B5/7 terminals: 2300 VAC for
1 min at a leakage current of 5 mA
max.
Between the external terminals and
the functional ground terminal: 2300
VAC for 1 min at a leakage current
of 5 mA max.
Between the external terminals and
internal circuits: 2300 VAC for 1 min
at a leakage current of 5 mA max.
Between the internal circuit and the
functional ground terminal: 510 VAC
for 1 min at a leakage current of 5
mA max.
I/O power supply
method
Supply from external source Current capacity
of I/O power
supply terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.30 W max.
• Connected to a Communications
Coupler Unit
0.95 W max.
Current
consumption from
I/O power supply
No consumption
Weight 70 g max.
Circuit layout 3185_sp_36_2
NO0 and NO1 are normal open contacts, and NC0 and NC1 are normal close contacts.
You cannot replace the relay.
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection
diagram
3185_sp_36_3
Disconnection/
Short-circuit
detection
Not supported. Protective
function
Not supported.

Relay Output Unit (Screwless Clamping Terminal Block, 24 mm Width)

NX-OC4633

Unit name Relay Output Unit Model NX-OC4633
Number of points 8 points, independent contacts External
connection
terminals
Screwless clamping terminal block
(8 terminals x 2)
I/O refreshing
method
Free-Run refreshing
Indicators TS indicator,
output indicator
3185_sp_37_1
Relay type N.O. contact
Maximum
switching capacity
250 VAC/2 A (cosφ = 1),
250 VAC/2 A (cosφ = 0.4),
24 VDC/2 A,
8 A/Unit
Minimum
switching capacity
5 VDC, 1 mA
Relay service life Electrical: 100,000 operations*
Mechanical: 20,000,000 operations
ON/OFF response
time
15 ms max./15 ms max.
Dimensions 24 (W) x 100 (H) x 71 (D) Isolation method Relay isolation
Insulation
resistance
Between output bits: 20 MΩ min.
(at 500 VDC)
Between the external terminals
and the functional ground terminal:
20 MΩ min. (at 500 VDC)
Between the external terminals and
internal circuits: 20 MΩ min.
(at 500 VDC)
Between the internal circuit and the
functional ground terminal: 20 MΩ
min. (at 100 VDC)
Dielectric
strength
Between output bits: 2300 VAC for
1 min at a leakage current of 5 mA
max.
Between the external terminals and
the functional ground terminal: 2300
VAC for 1 min at a leakage current
of 5 mA max.
Between the external terminals and
internal circuits: 2300 VAC for 1 min
at a leakage current of 5 mA max.
Between the internal circuit and the
functional ground terminal: 510 VAC
for 1 min at a leakage current of 5 mA
max.
Vibration
resistance
Conforms to IEC 60068-2-6.
5 to 8.4 Hz with amplitude of 3.5 mm,
8.4 to 150 Hz, acceleration of 9.8 m/s2
100 min each in X, Y, and Z directions
(10 sweeps of 10 min each = 100 min
total)
Shock resistance 100 m/s2, 3 times each in X, Y, and Z
directions
I/O power supply
method
Supply from external source Current capacity
of I/O power
supply terminal
Without I/O power supply terminals
NX Unit power
consumption
• Connected to a CPU Unit
2.00 W max.
• Connected to a Communications
Coupler Unit
1.65 W max.
Current
consumption from
I/O power supply
No consumption
Weight 140 g max.
Circuit layout 3185_sp_37_2
Installation
orientation and
restrictions
Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: As shown in the following.
3185_sp_37_3
Terminal
connection
diagram
3185_sp_37_4

* Electrical service life will vary depending on the current value. Refer to "NX-series Digital I/O Units User’s Manual" for details.

DC Input/Transistor Output Unit (MIL Connector, 30 mm Width)

NX-MD6121-5

Unit name DC Input/Transistor Output
Unit
Model NX-MD6121-5
Number of points 16 inputs/16 outputs External connection
terminals
2 MIL connectors (20 terminals)
I/O refreshing method Switching Synchronous I/O refreshing and Free-Run refreshing
Output
section
(CN1)
Internal I/O
common
NPN Input
section
(CN2)
Internal I/O
common
For both NPN/PNP
Rated voltage 12 to 24 VDC Rated input
voltage
24 VDC (15 to 28.8 VDC)
Operating load
voltage range
10.2 to 28.8 VDC Input current 7 mA typical (at 24 VDC)
Maximum value
of load current
0.5 A/point, 2 A/Unit ON voltage/
ON current
15 VDC min./3 mA min.
(between COM and each signal)
Maximum
inrush current
4.0 A/point, 10 ms max. OFF voltage/
OFF current
5 VDC max./1 mA max.
(between COM and each signal)
Leakage
current
0.1 mA max. ON/OFF
response time
20 μs max./400 μs max.
Residual
voltage
1.5 V max. Input filter
time
No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms,
16 ms, 32 ms, 64 ms, 128 ms,
256 ms
ON/OFF
response time
0.1 ms max./0.8 ms max.
Indicators TS indicator, I/O indicators
3185_sp_38_1
Dimensions 30 (W) x 100 (H) x 71 (D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated
circuits for 1 minute at a
leakage current of 5 mA max.
I/O power supply
method
Supply from external source
Current capacity of
I/O power supply
terminal
Without I/O power supply
terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communica-
tions Coupler Unit
0.70 W max.
Current consumption
from I/O power supply
30 mA max.
Weight 105 g max.
Circuit layout 3185_sp_38_2
Installation orientation
and restrictions
3185_sp_38_3
Terminal connection
diagram
3185_sp_38_4
Disconnection/Short-
circuit detection
Not supported. Protective function Not supported.

NX-MD6256-5

Unit name DC Input/Transistor Output
Unit
Model NX-MD6256-5
Number of points 16 inputs/16 outputs External connection
terminals
2 MIL connectors (20 terminals)
I/O refreshing method Switching Synchronous I/O refreshing and Free-Run refreshing
Output
section
(CN1)
Internal I/O
common
PNP Input
section
(CN2)
Internal I/O
common
For both NPN/PNP
Rated voltage 24 VDC Rated input
voltage
24 VDC (15 to 28.8 VDC)
Operating load
voltage range
20.4 to 28.8 VDC Input current 7 mA typical (at 24 VDC)
Maximum value
of load current
0.5 A/point, 2 A/Unit ON voltage/
ON current
15 VDC min./3 mA min.
(between COM and each signal)
Maximum
inrush current
4.0 A/point, 10 ms max. OFF voltage/
OFF current
5 VDC max./1 mA max.
(between COM and each signal)
Leakage
current
0.1 mA max. ON/OFF
response time
20 μs max./400 μs max.
Residual
voltage
1.5 V max. Input filter
time
No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms,
16 ms, 32 ms, 64 ms, 128 ms,
256 ms
ON/OFF
response time
0.5 ms max./1.0 ms max.
Indicators TS indicator, I/O indicators
3185_sp_39_1
Dimensions 30 (W) x 100 (H) x 71 (D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated
circuits for 1 minute at a
leakage current of 5 mA max.
I/O power supply
method
Supply from external source
Current capacity of
I/O power supply
terminal
Without I/O power supply
terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.10 W max.
• Connected to a Communica-
tions Coupler Unit
0.75 W max.
Current consumption
from I/O power supply
40 mA max.
Weight 110 g max.
Circuit layout 3185_sp_39_2
Installation orientation
and restrictions
3185_sp_39_3
Terminal connection
diagram
3185_sp_39_4
Disconnection/Short-
circuit detection
Not supported. Protective function With load short-circuit
protection.

DC Input/Transistor Output Unit (Fujitsu Connector, 30 mm Width)

NX-MD6121-6

Unit name DC Input/Transistor Output Unit Model NX-MD6121-6
Number of points 16 inputs/16 outputs External connection
terminals
2 Fujitsu connectors
(24 terminals)
I/O refreshing method Switching Synchronous I/O refreshing and Free-Run refreshing
Output
section
(CN1)
Internal I/O
common
NPN Input
section
(CN2)
Internal I/O
common
For both NPN/PNP
Rated voltage 12 to 24 VDC Rated input
voltage
24 VDC (15 to 28.8 VDC)
Operating load
voltage range
10.2 to 28.8 VDC Input current 7 mA typical (at 24 VDC)
Maximum value
of load current
0.5 A/point, 2 A/Unit ON voltage/
ON current
15 VDC min./3 mA min.
(between COM and each signal)
Maximum
inrush current
4.0 A/point, 10 ms max. OFF voltage/
OFF current
5 VDC max./1 mA max.
(between COM and each signal)
Leakage
current
0.1 mA max. ON/OFF
response time
20 μs max./400 μs max.
Residual
voltage
1.5 V max. Input filter
time
No filter, 0.25 ms, 0.5 ms, 1 ms
(default), 2 ms, 4 ms, 8 ms,
16 ms, 32 ms, 64 ms, 128 ms,
256 ms
ON/OFF
response time
0.1 ms max./0.8 ms max.
Indicators TS indicator, I/O indicators
3185_sp_40_1
Dimensions 30 (W) x 100 (H) x 71 (D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated
circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated
circuits for 1 minute at a
leakage current of 5 mA max.
I/O power supply
method
Supply from external source
Current capacity of
I/O power supply
terminal
Without I/O power supply
terminals
NX Unit power
consumption
• Connected to a CPU Unit
1.00 W max.
• Connected to a Communi-
cations Coupler Unit
0.70 W max.
Current consumption
from I/O power supply
30 mA max.
Weight 95 g max.
Circuit layout 3185_sp_40_2
Installation orientation
and restrictions
3185_sp_40_3
Terminal connection
diagram
3185_sp_40_4
Disconnection/Short-
circuit detection
Not supported. Protective function Not supported.

Version Information

Connected to a CPU Unit

Refer to the user's manual for the CPU Unit for details on the CPU Units to which NX Units can be connected.

NX Unit Corresponding versions *
Model Unit version CPU Unit Sysmac Studio
NX-ID3317 Ver.1.0 Ver.1.13 or later Ver.1.17 or higher
NX-ID3343
NX-ID3344
NX-ID3417
NX-ID3443
NX-ID3444
NX-ID4342
NX-ID4442
NX-ID5142-1
NX-ID5142-5
NX-ID5342
NX-ID5442
NX-ID6142-5
NX-ID6142-6
NX-IA3117
NX-OD2154
NX-OD2258
NX-OD3121
NX-OD3153
NX-OD3256
NX-OD3257
NX-OD3268
NX-OD4121
NX-OD4256
NX-OD5121
NX-OD5121-1
NX-OD5121-5
NX-OD5256
NX-OD5256-1
NX-OD5256-5
NX-OD6121-5
NX-OD6121-6
NX-OD6256-5
NX-OC2633
NX-OC2733
NX-OC4633
NX-MD6121-5
NX-MD6121-6
NX-MD6256-5

* Some Units do not have all of the versions given in the above table. If a Unit does not have the specified version, support is
   provided by the oldest available version after the specified version. Refer to the user’s manuals for the specific Units for the
   relation between models and versions.

Connected to a Communications Coupler Unit

NX Unit Corresponding versions *1
Model Unit
Version
EtherCAT EtherNet/IP
Communi-
cations
Coupler
Unit
NJ/NX-series
CPU Units or
NY-series
Industrial PCs
Sysmac
Studio
Communi-
cations
Coupler
Unit
Sysmac
Studio
NX-ID3317 Ver.1.0 Ver.1.0 or later Ver.1.05 or later Ver.1.06 or higher Ver.1.0 or later Ver.1.10 or higher
NX-ID3343
NX-ID3344 Ver.1.1 or later Ver.1.06 or later *2 Ver.1.07 or higher --- ---
NX-ID3417 Ver.1.0 or later Ver.1.05 or later Ver.1.06 or higher Ver.1.0 or later Ver.1.10 or higher
NX-ID3443
NX-ID3444 Ver.1.1 or later Ver.1.06 or later *2 Ver.1.07 or higher --- ---
NX-ID4342 Ver.1.0 or later Ver.1.05 or later Ver.1.06 or higher Ver.1.0 or later Ver.1.10 or higher
NX-ID4442
NX-ID5142-1 Ver.1.13 or higher Ver.1.13 or higher
NX-ID5142-5 Ver.1.10 or higher Ver.1.10 or higher
NX-ID5342 Ver.1.06 or higher
NX-ID5442
NX-ID6142-5 Ver.1.10 or higher
NX-ID6142-6 Ver.1.13 or higher Ver.1.13 or higher
NX-IA3117 Ver.1.08 or higher Ver.1.10 or higher
NX-OD2154 Ver.1.0 Ver.1.1 or later Ver.1.06 or later *2 Ver.1.07 or higher --- ---
NX-OD2258
NX-OD3121 Ver.1.0 or later Ver.1.05 or later Ver.1.06 or higher Ver.1.0 or later Ver.1.10 or higher
NX-OD3153
NX-OD3256
NX-OD3257
NX-OD3268 Ver.1.13 or higher Ver.1.13 or higher
NX-OD4121 Ver.1.06 or higher Ver.1.10 or higher
NX-OD4256
NX-OD5121
NX-OD5121-1 Ver.1.13 or higher Ver.1.13 or higher
NX-OD5121-5 Ver.1.10 or higher Ver.1.10 or higher
NX-OD5256 Ver.1.06 or higher
NX-OD5256-1 Ver.1.13 or higher Ver.1.13 or higher
NX-OD5256-5 Ver.1.10 or higher Ver.1.10 or higher
NX-OD6121-5
NX-OD6121-6 Ver.1.13 or higher Ver.1.13 or higher
NX-OD6256-5 Ver.1.10 or higher Ver.1.10 or higher
NX-OC2633 Ver.1.06 or higher
NX-OC2733 Ver.1.08 or higher
NX-OC4633 Ver.1.17 or higher Ver.1.17 or higher
NX-MD6121-5 Ver.1.0 Ver.1.0 or later Ver.1.05 or later Ver.1.10 or higher Ver.1.0 or later Ver.1.10 or higher
NX-MD6121-6 Ver.1.13 or higher Ver.1.13 or higher
NX-MD6256-5 Ver.1.10 or higher Ver.1.10 or higher

*1. Some Units do not have all of the versions given in the above table. If a Unit does not have the specified version, support
     is provided by the oldest available version after the specified version. Refer to the user’s manuals for the specific Units for
     the relation between models and versions.
*2. The instructions for time stamp refreshing are supported by CPU Units with unit version 1.06 or later. If you do not use
     instructions for time stamp refreshing, you can use version 1.05. Refer to the NJ/NX-series Instructions Reference Manual
     (Cat. No. W502) for details on the instructions for time stamp refreshing.