Omron NX-OD5256 — 16-Pt PNP Output 0.5 A / 4 A, 12 mm
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, screwless push-in 16-terminal connector. Selectable Synchronous or Free-Run I/O refresh on EtherCAT. The 16-point density sibling of the 8-point NX-OD4256 (already done).
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Product Overview
The 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. Each of the 16 outputs sources up to 0.5 A from a 24 VDC rail, with the total per-unit current capped at 4 A (so the practical continuous output is 16 × 0.25 A = 4 A on average; if any one output is sustained >0.5 A the overload protection triggers and that output is latched off until power-cycle).
Decoding the NX-OD5256 model number
NX = NX series modular I/O (EtherCAT / IOLink compatible); OD = Digital Output unit; 5 = 16-point density form factor (vs 4 = 8-point density, 6 = 32-point density); 2 = PNP sourcing output (vs 1 = NPN sinking); 5 = standard-speed response (vs 7 = high-speed 300 ns pulse for laser or stepper applications); 6 = NX-OD5256 model number identification. So NX-OD5256 = 16-pt PNP sourcing 24 VDC standard-speed transistor output, 0.5 A per point. Sibling products in the NX-OD family: NX-OD4121 (8-pt NPN sinking, done previously), NX-OD4256 (8-pt PNP sourcing, done previously), NX-OD5121 (16-pt NPN sinking), NX-OD5256-5 (16-pt PNP 16-pt with M12 connector — different suffix for terminal type), NX-OD5268 (32-pt PNP).
PNP sourcing output — what it means for wiring
PNP sourcing means the output point switches the +24 VDC side of the load: when the output is ON, the point sources +24 VDC to the load; when OFF, the point is high-impedance (the load sees 0 VDC). The load's return terminal connects to the unit's COM terminal, which is the common reference tied to 0 VDC. Typical wiring: PNP output #0 → 1 → solenoid valve A1 terminal; valve A2 → 0 VDC bus → returns to the unit's COM terminal. When the PLC writes a '1' to output bit 0, the output point sources +24 VDC, energizing the valve.
Grouping — 8 points per common
The 16 outputs are arranged as 2 groups of 8 outputs, each group with its own common terminal. Group 1: outputs 0-7 share one COM terminal; Group 2: outputs 8-15 share a second COM terminal. The two groups are independently switchable (one group can drive 24 VDC while the other is OFF or even unused).
Key Features
- NX-series 16-point PNP sourcing digital output unit
- Standard-speed transistor output
- 0.5 A per point continuous output current
- 4 A per unit total output current
- 15.0 to 28.8 VDC output voltage
- Screwless push-in connector
- 12 mm wide slice — same width as 8-point NX-OD4256
- EtherCAT-compatible via NX-ECC201 / 202 / 203 couplers
- SKU: NX-OD5256
- Series: NX-series Digital Output Units (NX-OD family)
- Voltage: 24 VDC
- I/O: 16 I/O
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.
- Cabinet indicator-light stack driver — 16 outputs each driving one 24 VDC panel indicator on a multi-station machine's operator station.
- 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-OD5256 for 16-pt PNP sourcing digital output — when you need higher density than NX-OD4256
- Pick NX-OD4256 for 8-pt PNP sourcing digital output — when 8 points per slice is enough
- Pick NX-OD4121 for 8-pt NPN sinking digital output — when the application uses NPN sinking
- Pick NX-OD5121 for 16-pt NPN sinking digital output — for Mitsubishi / older C-series PLC replacement
- Pick CJ1W-OD212 for 16-pt PNP sourcing output on CJ-series bus — when expanding an existing CJ1M/CJ2M rack, not EtherCAT
- Pick NX-OD3257 for high-speed pulse output — when application requires pulse-train or step-direction signaling
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 |
Resources & Downloads
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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