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NX-SI / SO

Safety I/O Unit

NX-SI / SO

Build a simple and flexible safety system

Regulations and Standards

Safety I/O Units NX-SI/SO

Certification body Standards
TÜV Rheinland *1 • EN ISO 13849-1
• EN ISO 13849-2
• IEC 61508 parts 1-7
• IEC/EN 62061
• IEC/EN 61131-2
• IEC 61326-3-1
UL • NRAG (UL 508 and ANSI/ISA 12.12.01)
• NRAG7 (CSA C22.2 No. 142 and CSA C22.2 No. 213)
Shipbuilding Standards NK, LK

*1 Using the NX-series Safety I/O Units in conjunction with the NX-series Safety CPU Unit allows you to build a safety control
     system that meets the following standards:
     • Requirements for SIL 3 in IEC 61508 and IEC/EN 62061
    • Requirements for PLe and Safety Category 4 in EN ISO 13849-1
   The NX-series Safety I/O Units are also registered for RCM, EAC, and KC compliance.

General Specifications

Item Specification
Enclosure Mounted in a panel (open)
Grounding method Ground to 100 Ω or less.
Operating
environment
Ambient operating temperature 0 to 55°C (The upper limit of the ambient operating temperature
is restricted by the installation orientation.)
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.
Noise immunity Conforms to IEC 61131-2.
2 kV on power supply line (Conforms to IEC 61000-4-4.)
Insulation class Class III (SELV)
Overvoltage category II
EMC immunity level Zone B
Vibration resistance 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 minutes each in X, Y, and Z directions (10 sweeps
of 10 min each = 100 min total)
Shock resistance Conforms to IEC 60068-2-27.
147 m/s2, 3 times each in X, Y, and Z directions
Insulation resistance 20 MΩ between isolated circuits (at 100 VDC)
Dielectric strength 510 VAC for 1 min between isolated circuits,
leakage current: 5 mA max.
Installation method DIN Track (IEC 60715 TH35-7.5/TH35-15)

Unit Specifications

Safety Input Units NX-SIH400/SID800

Unit name Safety Input Unit
Model NX-SIH400 NX-SID800
Number of safety
input points
4 points 8 points
Number of test
output points
2 points 2 points
Internal I/O common PNP (sinking inputs)
Rated input voltage 24 VDC (20.4 to 28.8 VDC)
OMRON special
safety input devices
Can be connected. Cannot be connected.
Number of safety
slave connections
1
I/O refreshing method Free-Run refreshing
External connection
terminals
Screwless clamping terminal block (8
terminals)
Screwless clamping terminal block (16
terminals)
Indicators 3244_sp_3_1 3244_sp_3_2
Safety input current 4.5 mA typical 3.0 mA typical
Safety input
ON voltage
11 VDC min. 15 VDC min.
Safety input OFF
voltage/OFF current
5 VDC max., 1 mA max.
Test output type Sourcing outputs (PNP)
Test output load
current
25 mA max. 50 mA max.
Test output
residual voltage
1.2 V max. (Between IOV and all output terminals)
Test output
leakage current
0.1 mA max.
Dimensions 12 × 100 × 71 mm (W × H × D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength 510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
I/O power supply
method
Power supplied from the NX bus
Current capacity of
I/O power supply
terminals
No applicable terminals.
NX Unit
power consumption
• Connected to a CPU Unit or a
Communication Control Unit *1
1.10 W max.
• Connected to a Communications Coupler
Unit *2
0.70 W max.
• Connected to a CPU Unit or a
Communication Control Unit *1
1.10 W max.
• Connected to a Communications Coupler
Unit *2
0.75 W max.
Current consumption
from I/O power supply
20 mA max.
Weight 70 g max.
Circuit layout 3244_sp_3_3 3244_sp_3_4
Terminal connection
diagram
Si0 to Si3: Safety input terminals
T0 and T1: Test output terminals
3244_sp_3_5
Refer to User's manual (Cat.No.Z930) for details.
Si0 to Si7: Safety input terminals
T0 and T1: Test output terminals
3244_sp_3_6
Refer to User's manual (Cat.No.Z930) for details.
Installation orientation
and restrictions
Installation orientation:
• Connected to a CPU Unit or a Communication Control Unit *1
Possible in the upright installation orientation.
• Connected to a Communications Coupler Unit *2
6 possible orientations.
Restrictions: Maximum ambient temperature is 50ºC for any orientation other than upright
installation.
Protective functions Overvoltage protection circuit and short detection (test outputs)

*1 It can be connected to the NX102 CPU unit or communication control unit. It cannot be connected to the NX1P2 CPU unit.
*2 The NX-ECC20 EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit can be connected.

Safety Output Units NX-SOH200/SOD400

Unit name Safety Output Unit
Model NX-SOH200 NX-SOD400
Number of safety
output points
2 points 4 points
Internal I/O common PNP (sourcing outputs)
Maximum load
current
2.0 A/point
4.0 A/Unit at 40°C
2.5 A/Unit at 55°C
The maximum load current depends on the
installation orientation and ambient
temperature. See Installation orientation
and restrictions.
0.5 A/point and 2.0 A/Unit
Rated voltage 24 VDC (20.4 to 28.8 VDC)
Number of safety
slave connections
1
I/O refreshing method Free-Run refreshing
External connection
terminals
Screwless clamping terminal block (8 terminals)
Indicators 3244_sp_4_1 3244_sp_4_2
Safety output ON
residual voltage
1.2 V max. (Between IOV and all output terminals)
Safety output OFF
residual voltage
2 V max. (Between IOG and all output terminals)
Safety output leakage
current
0.1 mA max.
Dimensions 12 × 100 × 71 mm (W × H × D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength 510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
I/O power supply
method
Power supplied from the NX bus
Current capacity of
I/O power supply
terminals
IOG: 2 A max./terminal IOG (A3 and B3): 2 A max./terminal
IOG (A7 and B7): 0.5 A max./terminal
NX Unit power
consumption
• Connected to a CPU Unit or a
Communication Control Unit *1
1.05 W max.
• Connected to a Communications Coupler
Unit *2
0.70 W max.
• Connected to a CPU Unit or a
Communication Control Unit *1
1.10 W max.
• Connected to a Communications Coupler
Unit *2
0.75 W max.
Current consumption
from I/O power supply
40 mA max. 60 mA max.
Weight 65 g max.
Circuit layout 3244_sp_4_3 3244_sp_4_4
Terminal connection
diagram
So0 and So1: Safety output terminals
IOG: I/O power supply 0 V
3244_sp_4_5
Refer to User's manual (Cat.No.Z930)
for details.
So0 to So3: Safety output terminals
IOG: I/O power supply 0 V
3244_sp_4_6
Refer to User's manual (Cat.No.Z930)
for details.
Installation
orientation
and restrictions
Installation orientation:
• Connected to a CPU Unit or a
Communication Control Unit *1
Possible in the upright installation
orientation.
• Connected to a Communications Coupler
Unit *2
6 possible orientations
Restrictions: For upright installation, the
ambient temperature is restricted as shown
below depending on the total Unit load
current.
3244_sp_4_7
For all installation orientations other
than upright installation, the ambient
temperature is restricted as shown
below according to the total Unit load
current.
3244_sp_4_8
Installation orientation:
• Connected to a CPU Unit or a Communication Control Unit *1
Possible in the upright installation
orientation.
• Connected to a Communications Coupler
Unit *2
6 possible orientations
Restrictions: None
Protective functions Overvoltage protection circuit and short detection

*1 The NX102 CPU Unit and the NX-CSG Communication Control Unit can be connected. The NX1P2 CPU Unit cannot be
     connected.
*2 The NX-ECC20 EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit can be connected.

Version Information

The following table shows the possible combinations of versions of NX-series Safety I/O Units, CPU Units, Communications Coupler Units, Communication Control Unit, and Sysmac Studio. Available functions that are related to safety control vary depending on the versions of the units and Sysmac Studio. Refer to the NX-series Safety Control Unit User's Manual (Cat. No. Z930) for details.

Safety Control Unit
model and version
NX bus master:
CPU Unit
NX bus master:
EtherCAT Coupler Unit
NX bus master:
EtherNet/IP
Coupler Unit
NX bus master:
Communication
Control Unit
Model Unit
version
NX102
CPU
unit
Sysmac
Studio
Commu-
nications
Coupler
Unit
NX-
ECC20[]
NJ/NX1P/
NX7
CPU Unit
*1
Sysmac
Studio
Commu-
nications
Coupler
Unit
NX-
EIC202
Sysmac
Studio
Commu-
nications
Control
Unit
NX-CSG
Sysmac
Studio
NX-SIH400 Ver.1.0 Ver.1.30
or later
Ver.1.22
or higher
Ver.1.2
or later
Ver.1.06
or later
Ver.1.07
or higher
--- --- Ver.1.00
or later
Ver.1.24
or higher
Ver.1.1 Ver.1.10
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.24
or higher
NX-SID800 Ver.1.0 Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher
NX-SOH200 Ver.1.0 Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher
NX-SOD400 Ver.1.0 Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher

*1 This is version information when the NJ/NX1P/NX7 CPU Unit is used as the EtherCAT master in the system. The Safety
     Control Unit cannot be connected directly to these CPU Units.