Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-MD6121-5 — 16 In / 16 Out NPN, MIL20
SKU: NX-MD6121-5USD 112.50
Omron NX-MD6121-5 NX mixed digital I/O, 16 DC inputs + 16 NPN outputs 0.5 A, 2 x MIL20, 30 mm wide. In stock, China shipping.
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Product Overview
The Omron NX-MD6121-5 is the NX-series mixed digital I/O unit with 16 DC inputs and 16 NPN transistor outputs, 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.
It sits on the NX I/O bus behind an NX-ECC201 EtherCAT Coupler or on the right of an NX102 / NX1P2 CPU and gives you 16 DC inputs (PNP or NPN selectable) and 16 NPN transistor outputs at 0.5 A per point, 2 A per common, on a single 30 mm slice. Input voltage range 15-28.8 VDC, ON/OFF delay 0.02-0.4 ms. Output ON/OFF delay 0.1/0.8 ms.
Two MIL20 connectors on the front accept industry-standard flat cables or OMRON XW2Z-[][]L pigtail cables. Photocoupler isolation 510 VAC. 30 x 100 x 71 mm, 155 g. The 32-output NPN sibling with MIL40 is NX-OD6121-5. The 32-output PNP with MIL40 is NX-OD6256-5. The 32-input only MIL40 is NX-ID6142-5.
Key Features
- NX-series mixed digital I/O unit with 16 DC inputs (PNP or NPN selectable, 15-28.8 VDC) and 16 NPN transistor outputs (0.5 A per point, 2 A per common)
- Input ON/OFF delay 0.02-0.4 ms (standard speed); output ON/OFF delay 0.1/0.8 ms; photocoupler isolation 510 VAC
- 2 x MIL20 connectors on the front for flat cable or XW2Z-[][]L pigtail, 30 (W) x 100 (H) x 71 (D) mm, 155 g, IP20
- Synchronous or Free-Run I/O refreshing on the NX I/O bus behind NX-ECC201 Coupler or NX102 / NX1P2 CPU
- SKU: NX-MD6121-5
- Series: NX-series Digital Mixed I/O Unit (NX-MD family) on NX I/O Bus
- I/O: 32 points
Best-Fit Applications
- Packaging line where 16 sensor inputs read fill-level, label-present, and cap-position signals and 16 NPN outputs control pneumatic valves and indicator lamps
- Conveyor cell where 16 photo-eye inputs feed the NX102-1200 CPU and 16 NPN outputs drive 24 VDC relay coils via interposing relays
- Spare replacement on an assembly station where the original NX-MD6121-5 was lost and Sysmac Studio has the I/O map on the SD card
Buying Checklist
- Pick the NX-MD6121-5 when the cell needs 16 inputs and 16 NPN outputs on MIL20 connectors on one 30 mm NX slice.
- Pick the NX-OD6121-5 instead when the cell needs only 32 NPN outputs (no inputs) on a single MIL40 connector.
- Pick the NX-OD6256-5 instead when the loads need PNP (sourcing) outputs instead of NPN (sinking) on a single MIL40 connector.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | NX-series Digital Mixed I/O Unit (NX-MD family) on NX I/O Bus |
| Model / SKU | NX-MD6121-5 |
| Total I/O | 32 points: 16 DC inputs (PNP or NPN selectable) + 16 NPN transistor outputs |
| Input Specs | 16 inputs, 24 VDC nominal (15 to 28.8 VDC operating range), input current ~6 mA per point, ON voltage 15 VDC min, OFF voltage 5 VDC max, ON/OFF delay 0.02 to 0.4 ms; 16 per common |
| Output Specs | 16 outputs, NPN (sinking), 12 to 24 VDC load, 0.5 A per point, 2 A per common, residual 1.2 VDC max, leakage 0.1 mA max, ON/OFF delay 0.1/0.8 ms; 16 per common |
| Short-Circuit Protection | Not on this -5 NPN variant (no per-point protection); load short-circuit detection at common level only |
| Connection | 2 x MIL20 connectors (not included); compatible with OMRON XW2Z-[][]L pigtail cables and standard flat cables |
| Isolation / Dielectric | Photocoupler isolation between input, output, and NX bus; 510 VAC for 1 minute |
| Refreshing | Synchronous I/O refreshing with EtherCAT cycle or Free-Run refreshing, set in Sysmac Studio |
| Power Consumption | NX unit power 1.20 W max on CPU; 0.95 W max on Coupler; I/O power from NX bus |
| Dimensions / Approvals | 30 (W) x 100 (H) x 71 (D) mm; 155 g; IP20; 0 to 55 C ambient; CE, cULus, RCM, KC |
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-MD6121-5
Does the NX-MD6121-5 accept PNP inputs?
Yes. The 16 inputs are PNP or NPN selectable per slice via the Sysmac Studio configuration. The 16 outputs are NPN (sinking) only - for PNP outputs, pick the NX-MD6121-6 (PNP variant) or use an NX-OD6256-5 output slice alongside.
What cable do I use with the NX-MD6121-5?
OMRON XW2Z-[][]L pigtail cable with MIL20 connector on the slice end and bare-end flying leads (or a terminal block) on the field end. Common lengths are 1 m, 1.5 m, 2 m, 3 m, 5 m, and 10 m. Any third-party MIL20 flat cable with 1.27 mm pitch also fits; the connector is industry-standard.
Does the NX-MD6121-5 have short-circuit protection?
Not on this -5 NPN variant. Output short-circuit detection is at the common level only (trips at 2 A per common) - no per-point protection. For per-point short-circuit protection and PNP outputs, pick the NX-MD6121-6. For NPN with per-point protection, pick the NX-OD5121-1 or NX-OD5121-5 (16-pt NPN).
What is the maximum operating voltage on the NX-MD6121-5?
15 to 28.8 VDC on the input channels (24 VDC nominal), 12 to 24 VDC on the output load (24 VDC typical). Outputs switch 0.5 A per point at 24 VDC, up to 2 A per common. Inputs draw about 6 mA per point at 24 VDC; ON at 15 VDC min, OFF at 5 VDC max.
How do I wire the NX-MD6121-5 to field devices?
Plug two XW2Z-[][]L pigtail cables (MIL20 connector on the slice end) into the front of the slice. The first MIL20 carries the 16 inputs; the second carries the 16 outputs. For NPN sensors, run the sensor negative to the slice common; for PNP sensors, switch the input mode in Sysmac Studio. Outputs sink to the slice common at 0.5 A per point.
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