Omron NX-SOD400 — NX Safety Output, 4-Point PNP, 24 VDC
SKU: NX-SOD400USD 128.00
NX safety output, 4-point PNP, 0.5 A/point (2 A/unit), 24 VDC, 12 mm wide. PLe / Cat 4 / SIL 3 with NX-SL Safety CPU.
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Product Overview
The NX-SOD400 is a 4-point safety output module for an NX-series EtherCAT slice. Each point is a 24 VDC PNP output rated at 0.5 A, with a total of 2 A per unit. Wire a redundant pair of outputs to a safety contactor coil and you get PLe / Category 4 / SIL 3 — the level most European and global machine builders target. The unit runs internal cross-fault checks on each output every cycle so ground or short faults are caught immediately.
Where it fits in a safety panel
Use the NX-SOD400 in panels that need four safe outputs — typically a robot-cell controller driving the robot stop, a door-lock release, an EDM (External Device Monitoring) input, and one spare. It pairs only with NX-SL Safety CPUs (SL3300 up to 16 safe I/O, SL3500 up to 32, SL5500 up to 128). It does not work with the regular NX102, NX502, or NX1P2 non-safety CPUs.
Getting the safety classification right
Two redundant outputs wired and cross-fault monitored together give PLe / Cat 4. A single wired-only output drops to Cat 1 / PL c, which is rarely the level you want. The wiring diagrams in the NX-series Safety Control Unit manual (z930) show the certified configurations for Cat 4. If you need higher current per output (2 A instead of 0.5 A) but only two outputs, use the NX-SOH200 instead.
Before ordering or installing
Order a matching NX-SL Safety CPU (SL3300, SL3500, or SL5500) — the NX-SOD400 does not work with non-safety NX CPUs. Plan the slice unit-power budget: high-density safety I/O can exhaust the coupler, in which case add an NX-PD1000. Use the manual's wiring diagrams to wire each redundant output pair; do not rely on a single output for Cat 4.
Key Features
- 4 safety outputs, 24 VDC PNP sourcing
- 0.5 A per point, 2 A per unit
- PLe / Cat 4 / SIL 3 when properly wired and monitored
- 12 mm wide — same as standard NX I/O units
- Screwless push-in terminals
- Pairs with NX-SL3300 / SL3500 / SL5500 Safety CPU
- Safety over EtherCAT (FSoE) or CIP Safety protocol
- SKU: NX-SOD400
- Series: NX-series safety I/O
- I/O: 4 I/O
Best-Fit Applications
- Robot-cell safety stop outputs
- Muting-light-curtain safety panel
- Body-in-white welding cell stop circuits
- Two-station e-stop replacement for G9SB panels
Buying Checklist
- Pick NX-SOD400 for 4-pt PNP safety output at 0.5 A/point (this SKU)
- Pick NX-SOH200 for 2-pt at 2 A/point when current is the limit
- Match with NX-SL3300 (≤16 safe I/O) or SL3500 (≤32 safe I/O)
- Add NX-PD1000 if the slice unit-power budget runs out
- Wire both outputs of each redundant pair for PLe / Cat 4
Technical Specifications
| Model | NX-SOD400 |
|---|---|
| Series | NX-series safety I/O |
| Outputs | 4 × 24 VDC PNP sourcing |
| Rated Load | 0.5 A per point, 2 A per unit |
| Safety Integrity | PLe / Cat 4 / SIL 3 (when properly wired) |
| Connection | Screwless push-in, 4-wire |
| Required CPU | NX-SL3300, SL3500, or SL5500 Safety CPU |
| Mounting | 35 mm DIN rail |
| Width | 12 mm |
| Operating Temperature | 0 to +55 °C |
Resources & Downloads
FAQ for NX-SOD400
What is the difference between NX-SOD400 and NX-SOH200?
Both are NX safety outputs with PNP sourcing at 24 VDC. NX-SOD400 (this SKU) has 4 outputs at 0.5 A per point and 2 A per unit. NX-SOH200 has 2 outputs at 2 A per point and 4 A per unit. Pick the SOD400 when you need four outputs of normal safety contactor current. Pick SOH200 when you need to drive a high-inrush load or a stack of indicator lamps.
Which Safety CPU do I need?
An NX-SL Safety CPU. SL3300 supports up to 16 safe I/O points, SL3500 up to 32, SL5500 up to 128. The NX-SOD400 cannot operate on NX102, NX502, NX1P2, or other non-safety NX CPUs — the safety protocol (FSoE or CIP Safety) requires the dedicated SafetyLogic CPU.
Can I use this as a regular output?
No. The NX-SOD400 only works under an NX-SL Safety CPU using FSoE or CIP Safety. For non-safety PNP outputs in an NX slice, use NX-OD4121 or NX-OD4256. You can mix safety and standard I/O in the same slice, but only via the right products.
What is the maximum load per point?
0.5 A continuous per point, with a total 2 A per unit. The on-state residual voltage is 1.2 V and the off-state leakage is 1 mA per point. A standard safety contactor coil pulls in well under 0.5 A, so 0.5 A is usually enough. If your load exceeds this, switch to NX-SOH200 (2 A per point) rather than adding a second NX-SOD400.
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