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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-OD6121-6 — front face of the 32-point NPN output unit showing the FCN40 Fujitsu/OTAX connector socket, the TS and per-point output indicator LEDs and the NX-OD6121-6 type label

Omron NX-OD6121-6 — 32-Pt NPN Output, FCN40

SKU: NX-OD6121-6

USD 82.00

NX 32-pt NPN output, 12-24 VDC, 0.5 A/pt, FCN40 Fujitsu/OTAX connector. In stock, China.

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Product Overview

The Omron NX-OD6121-6 is an NX-series 32-point NPN transistor output unit with an FCN40 Fujitsu/OTAX connector 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. Specifications on this page were checked against Omron's NX-series I/O System brochure (R183).

The unit drives 32 NPN outputs at 12 to 24 VDC with a maximum load of 0.5 A per point, 2 A per common, and 4 A per unit. ON/OFF response is 0.1 ms ON and 0.8 ms OFF for fast valve switching.

Body size is 30 x 100 x 71 mm at 90 g. Key specs: Number of Points 32 NPN outputs; Rated Voltage 12 to 24 VDC; Operating Load Voltage Range 10.2 to 28.8 VDC; Maximum Load Current 0.5 A per point, 2 A per common, 4 A per unit; Maximum Inrush Current 4.0 A per point, 10 ms max; ON/OFF Response Time 0.1 ms ON / 0.8 ms OFF; Residual Voltage 1.5 V max at load current; Leakage Current 0.1 mA max.

Key Features

  • NX-series 32-point NPN transistor output unit, 12-24 VDC
  • 0.5 A per point, 2 A per common, 4 A per unit, 0.1 ms ON response
  • FCN40 Fujitsu/OTAX connector (plug not included), Free-Run or Synchronous I/O
  • Photocoupler isolation, 30 x 100 x 71 mm, 90 g, no short-circuit protection
  • SKU: NX-OD6121-6
  • Series: NX-series Transistor Output Unit
  • Voltage: 12 TO 24 VDC
  • I/O: 32 I/O

Best-Fit Applications

  • Conveyor diverter array where each NPN outputs feeds a 24 VDC actuator and needs to ride along with a Free-Run NX-ECC203 EtherCAT coupler.
  • Servo amplifier control panel where 32 outputs drive enable, alarm-reset, and mode-select lines on 8 R88D-1SN servo drives.
  • High-density solenoid bank on a packaging machine where 32 NPN outputs switch pneumatic valves at a 0.1 ms cycle.

Buying Checklist

  • Choose the NX-OD6121-5 instead when the panel uses a MIL40 ribbon instead of FCN40.
  • Choose the NX-OD6256-5 instead when PNP sourcing outputs are required for the same load class.
  • Choose the NX-OD6121-6 when the cabinet uses a Fujitsu/OTAX FCN40 connector and the outputs are NPN.

Technical Specifications

Series NX-series Transistor Output Unit
Number of Points 32 NPN outputs
Rated Voltage 12 to 24 VDC
Operating Load Voltage Range 10.2 to 28.8 VDC
Maximum Load Current 0.5 A per point, 2 A per common, 4 A per unit
Maximum Inrush Current 4.0 A per point, 10 ms max
ON/OFF Response Time 0.1 ms ON / 0.8 ms OFF
Residual Voltage 1.5 V max at load current
Leakage Current 0.1 mA max
I/O Refreshing Method Synchronous I/O or Free-Run
External Connection FCN40 Fujitsu/OTAX connector (plug not included)
Dimensions 30 x 100 x 71 mm, 90 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-OD6121-6

Does the NX-OD6121-6 have short-circuit protection?
No - the NX-OD6121-6 does not include load short-circuit protection, and neither does the NX-OD6121-5 MIL40 NPN variant it is compared with: Omron's catalogue records Short-circuit protected outputs: FALSE for both. The connector, not the protection level, is what distinguishes them. For inductive loads, add an external flyback diode or a snubber across each coil to protect the output transistor from inductive kickback.
What is the difference between NX-OD6121-5 and NX-OD6121-6?
The NX-OD6121-5 uses a MIL40 connector and the NX-OD6121-6 uses the FCN40 Fujitsu/OTAX connector. Neither includes load short-circuit protection, so choose by connector type on the panel and fit external protection for inductive loads. Both are 32-point NPN at 0.5 A per point. Choose by connector type on the panel.
Can the NX-OD6121-6 mount on the NX-ECC203 EtherCAT coupler?
Yes - the NX-OD6121-6 mounts on any NX-ECC201, NX-ECC202, NX-ECC203 EtherCAT Coupler, on an NX-EIC202 EtherNet/IP Coupler, or directly on the NX102 modular CPU bus. Up to 63 NX slices can sit on the same sub-node at one time today.
What is the maximum cable run for NX-OD6121-6 outputs?
Output wiring runs are typically under 10 m when the load is a 24 VDC relay coil, and under 3 m for high-speed pneumatic valves where the 0.1 ms response is critical. Use shielded cable for runs over 5 m in noisy cabinets and route away from VFD power cables.

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