Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-OD6121-5 — 32-Pt NPN Output, MIL Connector
SKU: NX-OD6121-5USD 75.00
Omron NX-OD6121-5 NX-series 32-point NPN digital output, 12-24 VDC, 0.5 A/point, MIL40, 30 mm wide. In stock, China shipping.
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Product Overview
The Omron NX-OD6121-5 is a 32-point NPN (sinking) digital output unit for the NX-series I/O platform, manufactured by Omron Corporation. Hengyixin Automation stocks this controller option board 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).
It sinks 32 discrete 24 VDC loads at 0.5 A per point and 4 A per unit from a MIL40 connector (plug sold separately). ON/OFF response time is 0.1 ms max OFF-to-ON and 0.8 ms max ON-to-OFF. Omron's catalogue records Short-circuit protected outputs: FALSE for this unit. The refreshing method is selectable: Free-Run, Standard-speed synchronous, or full synchronous with the EtherCAT cycle.
The 30 mm wide housing mounts on any NX-series coupler: NX-EIC202 for EtherNet/IP, NX-ECC202 or NX-ECC203 for EtherCAT. Power consumption is 5.80 W max at 24 VDC. The XW2D-40G6 terminal block or XW2Z-xxxFF-L MIL40 cables (sold separately) convert the MIL40 to field wiring. The PNP sourcing version is the NX-OD6256-5. The 16-point MIL variant is the NX-OD5121-5.
Key Features
- NX-series 32-point NPN (sinking) digital output unit, 12 to 24 VDC rated, 0.5 A per point, 4 A per NX unit
- MIL40 connector (plug not included), 30 mm wide housing, 30 x 100 x 89.52 mm, 135 g, IP20
- ON/OFF response time 0.1 ms max OFF-to-ON and 0.8 ms max ON-to-OFF, no load short-circuit protection (per Omron's catalogue)
- Selectable Free-Run, Standard-speed synchronous, and synchronous I/O refreshing to match the EtherCAT cycle
- SKU: NX-OD6121-5
- Series: Omron NX-series I/O platform (NX-OD digital output family)
- Voltage: 12 TO 24 VDC
- I/O: 32 I/O
Best-Fit Applications
- High-density solenoid bank on a 32-valve pneumatic manifold where the MIL40 cables land on a single XW2D-40G6 terminal block
- Indicator-light stack on a multi-station assembly line where 32 PNP-driven 24 VDC beacons switch in sync with the EtherCAT cycle
- Spare replacement on a press line where the previous NX-OD6121 (screw terminal) is swapped for the MIL40 connector version to free panel space
Buying Checklist
- Pick the NX-OD6121-5 for a 32-point NX-series NPN output unit with a MIL40 connector on the 30 mm wide housing.
- Pick the NX-OD6256-5 instead when the field devices are PNP (sourcing) and the cabinet needs a sourcing 32-point output on the same MIL40 housing.
- Pick the NX-OD5121-5 instead when the panel only needs 16 outputs on the same MIL40 connector and the same 30 mm wide housing.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron NX-series I/O platform (NX-OD digital output family) |
| Model / SKU | NX-OD6121-5 |
| Number of Points | 32 NPN (sinking) digital outputs, 1-wire connection per output |
| Rated Voltage | 12 to 24 VDC (allowable voltage fluctuation 15.0 to 28.8 VDC at the output terminal) |
| Output Current | 0.5 A max per point, 4 A max per NX unit |
| Response Time | OFF-to-ON 0.1 ms max, ON-to-OFF 0.8 ms max at 24 VDC, 70 percent of rated load |
| Output Protection | Omron's catalogue records Short-circuit protected outputs: FALSE; residual voltage 1.5 V max, leakage current 0.1 mA max |
| I/O Refreshing | Free-Run refreshing, Standard-speed synchronous I/O refreshing, synchronous I/O refreshing (selectable per project) |
| I/O Connector | MIL40 connector (plug not included), 4 IOV (V+) and 4 IOG (V-) terminals, mating cable XW2Z-xxxFF-L or terminal block XW2D-40G6 |
| Isolation | Photocoupler isolation between field outputs and NX internal bus, 500 VAC for 1 minute |
| Power / Environment | 5.80 W max from NX bus at 24 VDC, 30 (W) x 100 (H) x 89.52 (D) mm, 135 g, IP20, 0 to +55 C operating, cULus / CE / KC / RCM listed |
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-OD6121-5
What is the Omron NX-OD6121-5 used for?
It is the NX-series 32-point NPN (sinking) digital output unit with a MIL40 connector and a 30 mm wide housing. It mounts on the NX backplane and drives 32 discrete 24 VDC loads at 0.5 A per point from an EtherCAT or EtherNet/IP NX coupler. It is the typical drop-in for high-density solenoid banks, indicator stacks, and small relay racks on machines that already use the NX-series I/O platform.
NX-OD6121-5 vs NX-OD6256-5 - what is the difference?
Both share the same 32-point body, MIL40 connector, and 30 mm wide housing. The -6121 is NPN (sinking); the -6256 is PNP (sourcing). Pick the -6121 for European-style NPN wiring where the load is tied to 24 VDC and the output switches the return side. Pick the -6256 for PNP wiring where the output sources 24 VDC to the load.
Does the NX-OD6121-5 work with synchronous I/O?
Yes. The NX-OD6121-5 supports Free-Run refreshing, Standard-speed synchronous I/O refreshing, and synchronous I/O refreshing matched to the EtherCAT cycle. Set the refreshing mode in the Sysmac Studio I/O Map for the unit. Free-Run is the typical default; switch to synchronous when the outputs must move in step with the encoder or the servo cycle.
What NX coupler works with the NX-OD6121-5?
Any of the NX-series communication couplers. For EtherNet/IP, use the NX-EIC202. For EtherCAT, use the NX-ECC202 or NX-ECC203. Up to 63 NX-OD6121-5 units (2,016 digital outputs) can sit on one NX-ECC203, limited by the coupler's power budget and the 30 mm slot count.
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