Part Number - CJ1W-ETN21

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Product Details

  • CJ1 Ethernet Control Module (CJ1WETN21)
  • Manufacturer: Omron
  • Series: CJ1

Product Description

The Omron CJ1W-ETN21 (CJ1WETN21) is a CJ1 series control module with ethernet ports. The control module may be mounted on a DIN rack and secured to the rack by the deploying of the mounting pin. When connecting with other modules, the CJ1W-ETN21 control module can connect with other modules by the connectors placed on the sides of each module and sliders added on the top of the modules.

The CJ1W-ETN21 control module (when participating in the CS-series PLC) can link to a hub with the 100 Base-TX cable (the 10 Base-T is also acceptable). This cable is an unshielded twisted pair that can maintain speeds of 100Mbps. The greatest length the cable can be is 100 meters. Additionally, the ETN21’s cable’s modulation method is a baseband (as signified by the ‘Base’). This allows the module to communicate PLCs from the CJ system, CP1H system, and NSJ system. It can also connect with a host computer that is capable of running a CX-programmer, CX-integrator, SYSMAC Gateway, and Fins Gateway.

The CJ1W-ETN21 control module connects with the modules system and 100 Base-TX cable by the ethernet connector which is integrated in the control module. There are three switches placed on the module, the first is a unit number switch which sets the number that the module will be positioned in the system. The other two node number switches of the CJ1W-ETN21 which sets the module’s FINS node number. On the side of the module there is a 12 digit ethernet address, there are also ten indicator lights on the module.

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Technical Specifications

Part Number: CJ1W-ETN21 (CJ1WETN21)
Module Type: Control Module
Ethernet Current Consumption: 370mA at 5V
Weight: 0.22lbs (0.1kg)

Related Parts

CJ1M-CPU12 - Omron CJ1 Programmable Module (CJ1MCPU12)
CJ1M-CPU13 - Omron CJ1 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-ETN21 comes with a one-year warranty.

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. Omron Authorized Supplier of Omron Automation. TRW Electric & Supply has many new and refurbished Omron CJ1 parts available for purchase.

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