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Omron CJ1W-MD231 — PLCs (Programmable Logic Controllers)

Omron CJ1W-MD231 I/O Module, 16 Digital In / 16 Solid State

MPNCJ1W-MD231
End of Life

Omron CJ1W-MD231 I/O Module, 16 Digital Inputs / 16 Solid State Outputs, DIN Rail, D-Sub, CE cULus NK, Active.

$271.46 – $611.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

CJ1W-MD231 — Identification
ParameterValue
SeriesCJ1W
CJ1W-MD231 — I/O
ParameterValue
Inputs (count and type)16 - Digital
Outputs (count and type)16 - Solid State
CJ1W-MD231 — Mechanical
ParameterValue
Mounting typeDIN Rail
Weight0.198 lb (89.81 g)
Termination styleD-Sub
CJ1W-MD231 — Approvals
ParameterValue
Approvals / certificationsCE, cULus, NK
CJ1W-MD231 — Other specifications
ParameterValue
TypeInput, Output (I/O) Module

Product details

Compared to the CJ1W-MD233

The CJ1W-MD231: The closest functional peer is the CJ1W-MD233, also 16 digital inputs and 16 solid state outputs. The critical difference: the MD231 uses a D-Sub connector, while the MD233 has a rectangular multi-pin connector. Same I/O count, same approvals (CE, cULus, NK), same CJ-series backplane – but the termination change means you cannot drop the MD231 into a panel wired for the MD233 without changing the connector or cable assembly.

Compliance & Approvals

Listed approvals: CE, cULus, NK. Covers European CE-marked installations, UL-listed control panels, and NK-classified marine applications. Documentation supporting these certifications is available from the manufacturer.

Frequently asked questions

What is the closest functional second-source for the CJ1W-MD231?

The CJ1W-MD233 offers the same 16 digital inputs and 16 solid state outputs, but uses a rectangular connector instead of D-Sub, so it is not a direct plug-in replacement.

What is the listed type of the CJ1W-MD231?

It is an Input, Output (I/O) Module.

What is the series of the CJ1W-MD231?

The series is CJ1W, part of the Omron CJ Series.

Will the CJ1W-MD231 drop into a panel wired for a CJ1W-MD233 without rewiring?

No. The MD231 terminates in a D-Sub connector, while the MD233 uses a rectangular multi-pin connector. The backplane connection and I/O count are identical, but the field wiring interface differs.

What compliance documentation is available for the CJ1W-MD231?

The module carries CE, cULus, and NK approvals. The manufacturer can provide declarations of conformity and certificates.

MPN
CJ1W-MD231