Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-OD5256 — 16 Pt PNP Output 0.5 A / 4
SKU: NX-OD5256USD 50.00
NX-series 16-point PNP sourcing 24 VDC transistor output unit, 0.5 A per point, 4 A per unit total, 0.5 ms ON / 1 ms OFF response
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Product Overview
The Omron NX-OD5256 is the 16-point density variant of the standard PNP sourcing transistor output unit in Omron's NX-series modular I/O family — when you need more than the 8 points provided by the NX-OD4256 (already in our catalog) per slice, you can double up to 16 points on the same 12 mm slice width. It is manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.
15.0 to 28.8 VDC output voltage 0.5 A per point continuous output current 4 A per unit total output current 12 mm wide slice — same width as 8-point NX-OD4256
Key specs: Model NX-OD5256; Series NX-series Digital Output Units (NX-OD family); Type 16-point PNP sourcing 24 VDC transistor output, standard speed.
Key Features
- 15.0 to 28.8 VDC output voltage
- 0.5 A per point continuous output current
- 4 A per unit total output current
- 12 mm wide slice — same width as 8-point NX-OD4256
- SKU: NX-OD5256
- Series: NX-series Digital Output Units (NX-OD family)
- Voltage: 24 VDC
- I/O: 16 points
Best-Fit Applications
- Pneumatic solenoid-valve matrix control on an assembly machine — NX-OD5256 drives 16 single-solenoid pneumatic valves; the 16 outputs on this.
- 24 VDC relay-coil driver in a control panel — NX-OD5256 drives the 24 VDC coils of G2R-2-SND DC24V relays at.
- Pick-and-place output signaling — the NJ501-1500 writes output bits to NX-OD5256 to control vacuum-destruction valves, gripper open/close, and reject-diverter cylinders.
Buying Checklist
- Pick NX-OD3257 for high-speed pulse output — when application requires pulse-train or step-direction signaling
- Pick NX-OD4121 for 8-pt NPN sinking digital output — when the application uses NPN sinking
- Pick NX-OD5256 for 16-pt PNP sourcing digital output — when you need higher density than NX-OD4256
Technical Specifications
| Model | NX-OD5256 |
|---|---|
| Series | NX-series Digital Output Units (NX-OD family) |
| Type | 16-point PNP sourcing 24 VDC transistor output, standard speed |
| Output Points | 16 points |
| Output Configuration | PNP sourcing (no contact) |
| Rated Output Voltage | 24 VDC nominal (operating range 15.0 to 28.8 VDC) |
| Per-Point Output Current | 0.5 A maximum (continuous) |
| Per-Unit Output Current | 4 A maximum total across 16 outputs |
| Output Groups | 2 groups of 8 outputs each |
| Residual Voltage (output ON) | 1.5 V max at 0.5 A load |
| Leakage Current (output OFF) | 0.1 mA max |
| Over-Temperature Protection | YES — per-channel thermal shutdown with status flag |
| Output Indicators | 16 orange LEDs (one per output, light when ON) |
| Mounting | NX-series slice rail, behind NX-ECC EtherCAT coupler or NX-ILM400 IOLink master |
| Operating Temperature | 0 to +55 °C |
Manufacturer documentation
Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.
FAQ for NX-OD5256
What's the difference between NX-OD5256 and NX-OD4256?
Both are NX-series PNP sourcing 24 VDC transistor output units with the same 0.5 A per-point and 4 A per-unit current rating, the same 12 mm slice width, the same I/O refresh options, and the same general electrical specs.
Can the NX-OD5256 be used with NPN loads?
No — the NX-OD5256 is PNP sourcing output only. PNP sourcing switches the +24 VDC side of the load; the load's return terminal connects to the COM terminal (0 VDC). If you connect a NPN sinking load (which expects the output to switch the 0 VDC side and have its positive terminal always at +24 VDC), the load would see constant +24 VDC regardless of the output state and never activate.
How do I configure the NX-OD5256 in Sysmac Studio?
Open Sysmac Studio and double-click the EtherCAT coupler (NX-ECC201/202/203) on the Multiview Explorer. The Studio shows the slice rail; drag the NX-OD5256 onto the rail at the desired position. Right-click the slice and select 'Edit Initial Settings' to configure: (a) I/O refresh method — choose Synchronous for time-critical outputs (e.g., trigger camera exposure at precise axis position) or Free-Run for general outputs; (b) per-channel short-circuit recovery mode (manual vs auto); (c) fault / status-flag assignment. Save and download.
What is the maximum peak current per output on the NX-OD5256?
The continuous rating is 0.5 A per point, but the per-point triac can deliver peaks of 1 A for the first few milliseconds (sufficient to charge the solenoid coil's magnetic circuit). The 1 A peak-withstand is short-term (typically 100 ms max), after which the overload protection triggers if the average current exceeds 1 A.
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