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Omron CJ1W-MD232 in its shipping carton with the type label, Omron logo, and slim 31 mm module profile visible

Omron CJ1W-MD232 — 16-In/16-Out Mixed I/O, PNP, MIL

SKU: CJ1W-MD232

USD 142.00

CJ-series 16 DC inputs + 16 PNP sourcing outputs in one slim 31 mm slot. 0.5 A/point, MIL connector, short-circuit alarm.

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Product Overview

The Omron CJ1W-MD232 puts 16 DC inputs and 16 PNP (sourcing) transistor outputs on a single 31 mm slim slot for CJ-series PLCs. Each input reads 24 VDC at 7 mA; each output switches up to 0.5 A from a 12-24 VDC source. Total output budget is 2 A per module — plan the 24 VDC supply for the worst case of all 16 outputs ON. The MIL connector on the front face takes a separate wiring harness.

When a mixed module is the right pick

A mixed I/O module is the natural fit for a small station where you need a handful of inputs and a handful of outputs in one slot — typical on packaging skids, OEM option panels, and retrofits where the rack is already full. If you need a dense input bank or a dense output bank, a dedicated 32- or 64-point module is cheaper per point and easier to wire.

PNP sourcing vs NPN sinking

The MD232 sources positive voltage to the load — the right match for modern European wiring and for PNP sensors feeding the inputs. If your field devices expect a negative common, pick CJ1W-MD231 (NPN sink) instead. The two modules use the same MIL pinout logic but the polarity is not interchangeable.

Before ordering

The MIL connector needs a separate wiring harness (XW2Z-series or equivalent) — the module ships without one. The MIL version also has per-point short-circuit detection that flags a bad output in the CJ CPU without dropping the rest of the bank. The unit draws 130 mA at 5 VDC from the CJ backplane.

Key Features

  • 16 DC inputs (24 VDC, 7 mA) and 16 PNP sourcing outputs in one module
  • 0.5 A per output point, 2 A per module maximum
  • Slim 31 mm slot — half the width of a 64-point module
  • MIL connector with per-point short-circuit detection and alarm
  • I/O addresses as 2 words (1 word in, 1 word out)
  • ON/OFF response time adjustable from 0 to 32 ms in the CPU settings
  • 130 mA internal current draw from the CJ backplane at 5 VDC
  • SKU: CJ1W-MD232
  • Series: CJ1W I/O unit for CJ-series PLCs
  • Voltage: 24 VDC
  • I/O: 16 I/O

Best-Fit Applications

  • Small station with a handful of sensor inputs and valve outputs on a CJ rack
  • OEM option panel where input and output count change between machine variants
  • Retrofit adding a couple of inputs and a couple of outputs to a full rack
  • Carton sealer station on a packaging line driving one heater and a few sensors
  • Utility skid combining level switches, pressure switches, and a couple of relay coils

Buying Checklist

  • Choose CJ1W-MD232 for 16-in/16-out PNP sourcing on a single slim 31 mm slot; pick CJ1W-MD231 if you need NPN sinking instead.
  • Plan a 24 VDC supply rated for the worst case of 16 outputs ON at 0.5 A — that is 2 A per module.
  • Order an XW2Z-series MIL wiring harness separately; the module ships without one.
  • Pick a 32- or 64-point dedicated input or output module if you only need I/O on one side — it is cheaper per point.
  • Use the per-point short-circuit alarm to catch a stuck relay coil or miswired output before it drops the rest of the bank.

Technical Specifications

Model CJ1W-MD232
Series CJ1W I/O unit for CJ-series PLCs
Module Type Mixed digital I/O (DC input + transistor output)
Input Points 16 DC inputs, 1 common
Output Points 16 PNP (sourcing) outputs, 1 common
Input Voltage / Current 24 VDC, 7 mA per point
Output Load Voltage 12 to 24 VDC
Max Load Current 0.5 A per point, 2 A per unit
Connection MIL connector, harness sold separately
I/O Words 2 (1 input word + 1 output word)
Protection Per-point short-circuit detection with alarm output
Internal Current Draw 130 mA at 5 VDC (from backplane)
Operating Temperature 0 to +55 °C

FAQ for CJ1W-MD232

What is the difference between CJ1W-MD232 and CJ1W-MD231?
MD232 is PNP sourcing (outputs source positive voltage to the load) and MD231 is NPN sinking (outputs switch the load to 0 V). Both are 16-in/16-out MIL-connector modules in the same slim 31 mm slot — pick the one that matches your panel's wiring convention.
Does the CJ1W-MD232 detect a short circuit on each output?
Yes. The MIL-connector MD232 has per-point short-circuit detection and a unit-level alarm flag that the CJ CPU can read. A shorted output is shut down individually and does not drop the rest of the bank.
What wiring harness does the CJ1W-MD232 need?
An Omron XW2Z-series MIL-connector wiring harness, or any third-party equivalent wired to a 40-pin MIL plug on the module side. The harness is sold separately — the module ships without one.
Can I mix MD232 (PNP) and MD231 (NPN) on the same CJ rack?
Yes. The two modules are pin-compatible in the I/O address map and can sit on the same rack. Just be sure your field devices and PLC input scan match the polarity of each module — they are not interchangeable on the same wiring harness.

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