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Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.

Omron NX-OD5121-1 — front view of the NX-series 16-point NPN output unit showing the Omron model label, the green TS indicator, the 16 yellow output LEDs and the 30 mm wide body

Omron NX-OD5121-1 — NX Output, 16 NPN, 30 mm

SKU: NX-OD5121-1

USD 62.00

Omron NX-OD5121-1 NX-series 16-point NPN output, 0.5 A/point, M3 screw terminal, 30 mm wide. In stock.

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Product Overview

The Omron NX-OD5121-1 is a 16-point digital transistor output unit, 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. Specifications on this page were checked against Omron's NX-series I/O System brochure (R183).

The unit ships 16 NPN (sinking) outputs at 0.5 A per point and 5 A per unit. Rated voltage is 12 to 24 VDC and the operating range is 10.2 to 28.8 VDC. ON response is 0.1 ms max, OFF response is 0.8 ms max. I/O refresh is selectable between Free-Run and Synchronous. Each output is isolated from the NX bus by a photocoupler, but Omron's catalogue records Short-circuit protected outputs: FALSE -- there is no load short-circuit protection on this unit.

The terminal block is a removable 18-point M3 screw block. The unit is 30 mm wide, 100 mm tall, and 95 mm deep, weighing 125 g. It drops onto the NX bus after an NX-ECC201 EtherCAT coupler or an NX-EIC202 EtherNet/IP coupler. For the 12 mm push-in sibling, pick the NX-OD5121.

Key Features

  • NX-series 16-point NPN (sinking) transistor output, 0.5 A per point, 5 A per unit
  • 12-24 VDC rated, 10.2-28.8 VDC operating, 0.1 ms ON / 0.8 ms OFF response. Omron's catalogue records Short-circuit protected outputs: FALSE
  • Removable 18-point M3 screw terminal block, 30 mm wide, photocoupler isolation
  • Mounts on the NX bus after an NX-ECC201 EtherCAT or NX-EIC202 EtherNet/IP coupler
  • SKU: NX-OD5121-1
  • Series: Omron NX-series digital I/O unit
  • Voltage: 12 TO 24 VDC

Best-Fit Applications

  • Solenoid-valve bank on a machine where the 16 NPN outputs drive 24 VDC valves directly from the NX bus
  • Spare replacement for an NX-OD5121 on a retrofit where the cabinet was wired for M3 screw terminals
  • Output slice on an NX102 EtherCAT drop where the unit sits next to the NX-ECC201 coupler in a high-vibration cabinet

Buying Checklist

  • Pick the NX-OD5121-1 for a 16-point NPN NX output with a removable M3 screw terminal block.
  • Pick the NX-OD5121 instead when the cabinet uses 12 mm push-in wiring and the smaller body is acceptable.
  • Pick the NX-OD5256-1 instead when the load needs PNP (sourcing) outputs instead of NPN (sinking).

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron NX-series digital I/O unit
Model / SKU NX-OD5121-1
Number of Outputs 16 NPN (sinking) transistor outputs
Rated Voltage 12 to 24 VDC
Operating Range 10.2 to 28.8 VDC
Output Current 0.5 A per point, 5 A per unit
ON / OFF Response 0.1 ms max / 0.8 ms max
I/O Refresh Synchronous or Free-Run selectable
Protection Photocoupler isolation. Omron's catalogue records Short-circuit protected outputs: FALSE
Terminal Block 18-point M3 screw, removable
Dimensions / Weight 100 (H) x 30 (W) x 95 (D) mm, 125 g, IP20

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-OD5121-1

What is the difference between NX-OD5121 and NX-OD5121-1?
NX-OD5121 is the 12 mm push-in variant. NX-OD5121-1 is the 30 mm M3 screw variant. Both share the same 16-point NPN output, the same 0.5 A per point rating, and the same 5 A total limit.
Does the NX-OD5121-1 need an external power supply?
No fixed supply is needed. Power is drawn from the NX bus through the upstream coupler (NX-ECC201 or NX-EIC202). The 12-24 VDC load voltage is fed to the V+ and V- terminals on the unit.
Can the NX-OD5121-1 fit on an NX1P2 CPU?
Yes. The NX-OD5121-1 connects directly to the right side of an NX1P2 CPU or any NX-series EtherCAT / EtherNet/IP coupler.
Does the NX-OD5121-1 have short-circuit protection?
No. Omron's catalogue records Short-circuit protected outputs: FALSE for the NX-OD5121-1, so a load short circuit is not detected or latched by the unit. For inductive loads, fit a flyback diode or an RC snubber across each coil, and a fuse or protector block if the load can fault to earth.
How is the terminal block removed on the NX-OD5121-1?
Pull straight down on the orange release lever below the terminal block. The block slides off the unit body for bench wiring. Do not pull on the wires.

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