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Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.

Omron CJ2M-MD211 — front view of the pulse I/O module showing the Omron model label, the MS indicator LED on the top, the 7-segment status display, the MIL 40-pin I/O connector socket and the CX-Unit configuration access right side

Omron CJ2M-MD211 — Pulse I/O Module, NPN, CJ2M

SKU: CJ2M-MD211

USD 65.00

Omron CJ2M-MD211 CJ2M pulse I/O module, NPN, 10 in / 6 out, 100 kHz HSC, 100 kpps pulse output, MIL connector. In stock.

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Product Overview

The Omron CJ2M-MD211 is a CPU-bus pulse I/O module for the CJ2M PLC family, 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 CJ2M Pulse I/O Block specification table (Omron Taiwan). Production is planned to end on 2027-06-30.

The module has 10 NPN digital inputs: 4 interrupt or quick-response inputs and 2 high-speed counter inputs. It has 6 NPN digital outputs: 2 pulse-train outputs (CW / CCW or pulse + direction), 2 PWM outputs, and 2 standard outputs. Max pulse output frequency is 1 pps to 100 kpps per block and max counter input is 100 kHz single-phase / 50 kHz differential.

The I/O connector is a MIL 40-pin plug (the plug itself is not included; order a XG4M-4030-T or compatible separately). The body is 20 x 90 x 66.3 mm, 70 g, DIN-rail mounted. Up to 2 modules fit on one CJ2M CPU. Compatible CPUs are CJ2M-CPU11 through CJ2M-CPU15 (basic) and CJ2M-CPU31 through CJ2M-CPU35 (high-end).

Key Features

  • CJ2M CPU-bus pulse I/O module, NPN, 10 inputs (4 interrupt / 2 HSC) + 6 outputs (2 pulse / 2 PWM / 2 standard)
  • Max counter input 100 kHz single-phase / 50 kHz differential, 1 pps to 100 kpps per block max pulse output
  • MIL 40-pin detachable I/O connector (plug ordered separately)
  • Up to 2 modules per CJ2M CPU; pairs with CJ2M-CPU11 / CPU15 / CPU31 / CPU35
  • SKU: CJ2M-MD211
  • Series: Omron CJ2M-series CPU-bus pulse I/O module

Best-Fit Applications

  • Two-axis stepper indexer on a packaging machine where the CJ2M-CPU33 drives the MD211 for 100 kHz encoder feedback and 1 pps to 100 kpps per block pulse command
  • Conveyor synchronisation where one MD211 holds 4 interrupt inputs for product-tracking photo eyes and 2 PWM outputs for variable-speed drives
  • Spare replacement on a CJ2M-CPU35 cell where the prior MD211 module failed and the 100 kHz HSC keeps the indexer under closed-loop control

Buying Checklist

  • Pick the CJ2M-MD211 for a CJ2M CPU-bus pulse I/O module with NPN I/O on the MIL connector.
  • Pick the CJ2M-MD212 instead when the field wiring needs PNP sourcing I/O on the same CJ2M platform.
  • Pick the CJ1W-NC413 instead when the application needs 4 axes on a CJ1-series CPU bus.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CJ2M-series CPU-bus pulse I/O module
Model / SKU CJ2M-MD211
I/O System CJ CPU Bus
Digital Inputs 10 NPN: 4 interrupt / quick-response + 2 high-speed counter
Digital Outputs 6 NPN: 2 pulse + 2 PWM + 2 standard
Max Counter Frequency 100 kHz single-phase; 50 kHz differential; input response time selectable 0/0.5/1/2/4/8/16/32 ms, default 8 ms; differential or DC 24 V input selected by wiring
Max Pulse Output Frequency 1 pps to 100 kpps per block
I/O Connector MIL 40-pin detachable (plug ordered separately)
Max Modules per CPU 2
Compatible CPUs CJ2M-CPU11 / CPU12 / CPU13 / CPU14 / CPU15; CJ2M-CPU31 / CPU32 / CPU33 / CPU34 / CPU35
Dimensions (W x H x D) 20 × 90 × 66.3 mm; 70 g; production-end date not confirmed for this module

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 CJ2M-MD211

Does the CJ2M-MD211 need a separate power supply?
No. The module takes logic power from the CJ CPU Bus. The 24 VDC field supply for the inputs and outputs is wired through the MIL connector from the same 24 VDC rail that powers the CJ2M CPU.
Can the CJ2M-MD211 fit on a CJ2H CPU?
No. The MD211 sits on the CJ2M CPU Bus. The CJ2H-CPU64 / CPU65 / CPU66 / CPU67 / CPU68 use the CJ1W platform. For position control on a CJ2H, use the CJ1W-NC213 or CJ1W-NC413 module.
What is the end-of-production date for the CJ2M-MD211?
We could not confirm an end-of-production date for the MD211 itself. Omron publishes a planned production end of March 2028 for the CJ2M-CPU3[] CPU, which is a different product. Confirm the module's own position with Omron before ordering spares. The CJ2M-MD212 is the same block with sourcing (PNP) outputs rather than sinking (NPN) - it is a variant choice, not an end-of-life replacement. We could not find an Omron replacement designation for the MD211 itself; confirm the position with Omron for your regions.

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