Part Number - CJ1W-EIP21

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Product Details

  • CJ1 Ethernet Control Module (CJ1WEIP21)
  • Manufacturer: Omron
  • Series: CJ1

Product Description

The Omron CJ1W-EIP21 (CJ1WEIP21) is a CJ1 control module with ethernet IP communication. The control module has a current consumption of 410mA when it is at 5V. While the CJ1W-EIP21 control module is in the CS-series PLC configuration, it will connect to a switching hub that links to a host computer network configure and other PLCs from the CJ-series, NJ-series, CP1H-series, and NSJ-series. The connection between the CJ1W-EIP21 Ethernet IP control module and the hub can be no more than 100 meters. The switching hubs that can be used are the W4S1-03B, the W4S1-05B, and the W4S1-05C. The first hub has three ports and the other two have five ports. All ports have a current consumption of 0.22 Amp. The hubs’ functions are first, controlling the quality of service (QoS) rendered and secondly, failure detection (that only the W4S1-05C has). Between two to eight modules can be mounted on each CPU rack, expansion rack, expansion backplane, or CP1H PLC depending on the system used.

On the CJ1W-EIP21 control module there is five LED indicators which are all emblematic of the status of the network and control module. There are also three switched, the first being a unit number switch which sets the number in which it is in the configuration, the other two are node address switches which set the node address. Lastly, there is an Ethernet connector integrated in the CJ1W-EIP21 that concatenates with a shielded twisted-pair (STP) cable that follows the electrical specifications of IEEE802.3 and a connector structure of RJ445 8-pin modular connector. The Ethernet interface used is either a 100BASE-TX or a 10BASE-T.

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Technical Specifications

Part Number: CJ1W-EIP21 (CJ1WEIP21)
Module Type: Control Module
Ethernet IP Current Consumption: 410mA at 5VDC
Weight: 0.21lbs (0.094kg)

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-EIP21 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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