Part Number - CS1W-ETN21

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Product Details

  • CS1 Ethernet Control Module (CS1WETN21)
  • Manufacturer: Omron
  • Series: CS1

Product Description

The Omron CS1W-ETN21 (CS1WETN21) is a CS1 series control module with a ethernet port. This control module has three switches; the first one is unit number switch which set the unit number for this module and the other two switches are node address switches. These switches control the module’s FINS (Factory Interface Network Service) node number. There is finally the ethernet port. The connector needed for the CS1W-ETN21’s port is one that follows RJ45 8-pin modular connector and conforms to the IEEE802.3 electrical specifications.

The Ethernet cable that is optimal for the CS1W-ETN21 control module is the 100BASE-TX. This cable has a frequency of 100MHz and a baseband that allows the control module to use all the bandwidth that is accessible at the time. The control modules communication can span up to 100 meters. The wiring is an unshielded twisted pair (UTP). The 10BASE-T cable can also be used. This wire permits this control module to communicate with other Omron configurations and personal computers that support a CX-Programmer, a CX-Integrator, SYSMAC Gateway, or Fins Gateway protocol in the Ethernet system’s hub. There are three industrial switching hubs the CS1W-ETN21 may connect with, and those are the W4S1-03B, the W4S1-05B, and the W4S1-05C. All of these have a current consumption of 0.22A.

The CS1W-ETN21 control module is compatible with two different systems: the CS1 system and the CS1D system. However in both systems, this control module can only be placed on a CPU rack or an expansion backplane. In any case, it can only be with 4 other units per CPU.

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Technical Specifications

Part Number: CS1W-ETN21 (CS1WETN21)
Module Type: Control Module with a Ethernet Port
Weight: 0.44lbs (0.2kg)

Related Parts

CJ2M-CPU33 - Omron CJ2 Control Module
CJ2M-CPU32 - Omron CJ2 Control Module
CS1H-CPU63 - Omron CS1 Control Module (CS1HCPU63)

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 CS1 Shipping options vary by location. Call for an accurate quote.


  • The Omron CS1W-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 CS1 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 CS1 parts available for purchase.

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