Part Number - CJ1W-CT021

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CJ1W-CT021 is

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Product Details

  • CJ1 Counter Control Module (CJ1WCT021)
  • Manufacturer: Omron
  • Series: CJ1

Product Description

The Omron CJ1W-CT021 (CJ1WCT021) is a high speed counter CJ1 series control module. The control module has 2 high speed counters but has three counter types which may be selected by the DIP switch. The three counter types are "Simple, Circular and Linear" counters. The signals given by the CT021 per counters are denoted by phases A, B, and Z. Also included are digital input output points. There are two digital inputs which are represented by the numbers I0 and I1. And there are two outputs similarly indicated with O0 and O1.

The CJ1W-CT021 control module has an input for these phases are influenced by the varying input voltages of the CT021. Phases A and B may have a voltage of 24VDC with a current of 8mA, a voltage of 12VDC with like current, or a voltage of 5VDC with a current of 7mA. The CJ1W-CT021’s phase Z may have the same input voltages with the corresponding currents of 7.3mA, 6.6mA, and 6mA. The digital inputs described above will have an input voltage of 24VDC and an input current of 7.6mA. The voltage output has a range between 12 to 24V with a current of 30mA.

The Omron CJ1W-CT021 counter control module appositely fits in the classic Omron configuration. The Omron configuration should have a power supply unit at the utmost left, then a CJ1-H or CJ1M CPU to the right of that. The CJ1W-CT021 control module needs to be one of the first five specialized input output counters directly right of the CPU in order to support its external interrupts tasks.

Here is the source material that may have been referenced:

Technical Specifications

Part Number: CJ1W-CT021 (CJ1WCT021)
Module Type: Control Module
Number of Counters: 2 - Input Output
Weight: 0.22lbs (0.1kg)

Related Parts

CJ1M-CPU12 - Omron CJ1 Programmable Control Module (CJ1MCPU12)
CJ1M-CPU13 - Omron CJ1 Control Module (CJ1MCPU13)
CJ1M-CPU21 - Omron CJ1 Control Module (CJ1MCPU21)

Shipping and Order Information

  • TRW Supply can usually ship in stock items same day before 3:30 PM EST for no extra cost and before 5 PM with a rush fee
  • Omron CJ1 Shipping options vary by location. Call for an accurate quote.


  • The Omron CJ1W-CT021 comes with a two year warranty.
  • A three year warranty is available. Please inquire for pricing.

Additional Information

TRW Electric & Supply Company is a global automation supplier. We deliver reliable new and refurbished parts at a great value. Our product focus is Omron and Mitsubishi products, but we have been able to provide our customers with solutions from other manufacturers as well. Our goal is to supply the automation industry with the best service and pricing, and of course conduct business with a high level of integrity.

Authorized Distributors

A Omron Authorized Distributor for CJ1 is not the only source for Omron products. Many of the Omron products have been discontinued and therefore are no longer available from authorized suppliers. TRW Electric & Supply has many new and refurbished Omron CJ1 parts available for purchase.

More Information: CJ1W CT 021, CJ1 WCT 021, CJ1W CT 021, CJ1 W-CT 021

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