GlobalThe general specifications, communication specifications, safety specifications, and unit specifications of the safety I/O Block are as follows.
NXR-SXD1204[]-CST
NXR-S series Simple Logic Safety I/O Block for CIP Safety
![NXR-SXD1204[]-CST](/Images/pf_3964-13-336048-198x198.jpg)
One safety I/O block for every machine − standardized, scalable, and easy to deploy
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last update: August 3, 2026
Specifications
General Specifications
| Item | Specifications | |
|---|---|---|
| Degree of protection | IP67 | |
| Operating
environment |
Ambient operating temperature | -10 to 55°C |
| Ambient operating humidity | 25% to 85% (with no condensation) | |
| Atmosphere | Must be free from corrosive gases. | |
| Storage temperature | -25 to 65°C | |
| Storage humidity | 25% to 85% (with no condensation) | |
| Altitude | 2,000 m max. | |
| Pollution degree | 3 or less: Conforms to IEC 61010-2-201 | |
| Noise immunity | 2 kV on power supply line (Conforms to IEC 61000-4-4) | |
| Overvoltage category | Category II: Conforms to IEC 61010-2-201 | |
| EMC immunity level | Zone B | |
| Vibration resistance | 10 to 60 Hz with amplitude of 0.35 mm, 60 to 150 Hz, and 50 m/s2
80 min each in X, Y, and Z directions |
|
| Shock resistance | 150 m/s2, 3 times each in 6 directions along X, Y, and Z axes | |
| Dielectric strength | 600 VAC (between isolated circuits) | |
| Insulation resistance | 20 MΩ min. (between isolated circuits) | |
| Conformance
to standards * |
TÜV Rheinland | • EN 61508 parts 1-3
• EN ISO 13849-1 • EN ISO 13849-2 • EN IEC 61131-2 • IEC 61326-3-1 • EN 60529 • EN 61131-6 |
| UL | • NRAQ/NRAQ7
• UL 61010-1 and UL 61010-2-201 • CSA C22.2 No. 61010-1 and CSA C22.2 No. 61010-2-201 • FSPC (IEC 61508 parts 1-3 and ISO 13849-1) |
|
| ODVA | • CIP Safety on EtherNet/IP
• EtherNet/IP |
|
| Other | • EU: EN 61131-2, RCM
• UKCA • KC: KC Registration • Machinery Directive or Machinery Regulation |
|
* For safety certification, please refer to the OMRON website.
Communications Specifications
| Item | Specifications | |
|---|---|---|
| Physical
specifications |
Port | Layer-2 switch port |
| Physical layer | 10BASE-T/100BASE-TX
Auto negotiation or fixed settings |
|
| Media access
method |
CSMA/CD | |
| Modulation | Baseband | |
| Topology | Line, star, tree, ring | |
| Baud rate | 100 Mbps (100BASE-TX) | |
| Transmission
media |
Category 5 or higher twisted-pair cable (Recommended cable:
double-shielded cable with aluminum tape and braiding) |
|
| Transmission
distance |
100 m or less (Distance between nodes and between hub and node) | |
| CIP Safety | CIP Safety target | Supported |
| Maximum number
of connections |
5 (Input 2/Output 3)
Input connections can share the same data with up to 8 CIP Safety originators by using Multicast communication. |
|
| Packet interval | 5 to 500 ms | |
| Maximum data size | Input: 9 bytes
Output: 3 bytes |
|
| EtherNet/IP
communications |
EtherNet/IP target | Supported (Exclusive Owner, Input Only, Listen Only) |
| Maximum number
of connections |
2 (Input 2/Output 0) | |
| Packet interval | 5 to 10,000 ms | |
| Maximum data size | Input: 9 bytes | |
| DLR | Ring nodes supported | |
| CIP message
communications |
Protocol | Class3/UCMM |
| Maximum number
of connections (Class 3) |
5 | |
| Data size | 504 bytes | |
| CIP
communications |
Quick Connect | Not supported |
| HTTPS
communications |
TLS version | TLS 1.2 and TLS 1.3 is supported.
TLS 1.0, TLS 1.1, and SSL are not supported. |
| Authentication
method |
Server authentication (X.509) and session authentication by safety password | |
The following table shows whether a communications path encryption function is available, whether enabled or disabled by default, and whether switchable between enable and disable for each external interface.
| External interface | Communications
path encryption |
Enabled/disabled
by default |
Whether enable/disable switchable | |
|---|---|---|---|---|
| Ethernet
port |
CIP Safety | No | Enabled | Not possible |
| HTTPS | Yes | Enabled | Not possible | |
| SNTP | No | Disabled | Possible by Sysmac Studio, Web server function,
and CIP message |
|
| DHCP | No | Disabled | Possible by Sysmac Studio, Web server function,
and CIP message |
|
| EtherNet/IP | No | Enabled | Not possible | |
| CIP messages | No | Enabled | Not possible | |
| Physical
interface |
Rotary switches | Not applicable | Enabled | Not possible |
Safety Specifications
| Item | Specifications | |||
|---|---|---|---|---|
| Safety input | Safety output | |||
| Dual channel | Single channel | Dual channel | Single channel | |
| PL | Up to PL e | Up to PL d | Up to PL e | Up to PL c |
| Category | Up to Cat.4 | Up to Cat.2 | Up to Cat.4 | Up to Cat.2 |
| Mission Time | 20 years | 20 years | 20 years | 20 years |
| SIL | Up to SIL 3 | Up to SIL 2 | Up to SIL 3 | Up to SIL 1 |
| PFH | 4.6 × 10-10
1/h |
4.6 × 10-10
1/h |
4.6 × 10-10
1/h |
4.6 × 10-10
1/h |
Note: Refer to the User’s Manual (Man.No.W546) for details.
Unit Specifications
| Item | Specifications | ||
|---|---|---|---|
| NXR-SXD1204-CST | NXR-SXD1204B-CST | ||
| Unit name | Environment-resistive Remote Terminal NXR-S series Simple Logic Safety I/O
Block for CIP Safety |
||
| Dimensions [mm] | 60 × 240 × 34.2 mm (W × H × D)
(The depth is 46.65 mm when the connectors are included.) |
||
| Mounting method | Mounting with M5 screws | ||
| Mounting strength | 100 N | ||
| Mounting orientation
and restrictions |
Mounting orientations: Six orientations
Restriction: None |
||
| Available connectors | • EtherNet/IP communications connectors: M12 (D-coding, female)
• Power supply connectors: M12 (L-coding, female), M12 (L-coding, male) • I/O connectors: M12 (A-coding, female) |
||
| Connector strength | 30 N
Applicable to all connectors |
||
| Screw tightening torque | • Unit mounting (M5 screw): 1.47 to 1.96 N⋅m
• Rotary switch cover (M3 screw): 0.4 to 0.6 N⋅m |
||
| Weight | 710 g | 700 g | |
| Unit/input power supply
voltage |
24 VDC (19.2 to 28.8 VDC) | ||
| Output power supply
voltage |
24 VDC (19.2 to 28.8 VDC) | ||
| Isolation method | Digital isolator isolation | ||
| Isolation inside the Unit | Isolate between the Unit/input power supply and output power supply | ||
| Insulation resistance | 20 MΩ min. between isolated circuits (at 100 VDC) | ||
| Maximum power supply
current |
9 A | ||
| Unit current consumption | • Unit/Input power supply: 220 mA
• Output power supply: 40 mA |
||
| Number of
safety I/O Block |
Number of
safety input terminals |
12 | |
| Number of
test output terminals |
12 | ||
| Number of
safety output terminals |
4 | ||
| Number of
I/O ports |
Safety input
port |
5 pins × 6 ports | 5 pins × 4 ports |
| Safety output
port |
4 pins × 2 ports | 0 | |
| Safety I/O
Ports |
0 | 8 pins × 2 ports | |
| Number of
terminals per I/O port |
Safety input
port |
• Safety inputs: 2
• Test outputs: 2 • Unit/input power supply -: 1 |
|
| Safety output
ports |
• Safety outputs: 2
• Output power supply -: 2 |
--- | |
| Safety I/O
Ports |
--- | • Safety inputs: 2
• Test outputs: 2 • Safety outputs: 2 • Unit/input power supply -: 1 • Output power supply -: 1 |
|
| Safety input current | 4.5 mA typical | ||
| Safety input ON voltage | 11 VDC min. | ||
| Safety input OFF voltage/OFF current | 5 VDC max./1 mA max. | ||
| Test output type | Sourcing outputs (PNP) | ||
| Test output rated current | 0.7 A/point | ||
| Test output ON residual voltage | 1.2 V max. (Unit/input power supply + and each output terminal) | ||
| Test output leakage current | 0.1 mA max. | ||
| Safety output internal I/O common | PNP (sourcing outputs) | ||
| Safety output maximum load current | 2.0 A/point 9.0 A/Unit | 0.7 A/point 9.0 A/Unit | |
| Safety output ON residual voltage | 1.2 V max. (between output power supply + and each output terminal) | ||
| Safety output OFF residual voltage | 2 V max. (between output power supply - and each output terminal) | ||
| Safety application function | Fixed applications, add-on applications, and user-defined applications | ||
last update: August 3, 2026
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