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Omron CJ1W-ETN21 — PLCs (Programmable Logic Controllers)

Omron CJ1W-ETN21 Communications Module, 100BASE-TX

MPNCJ1W-ETN21
End of Life

Omron CJ1W, Communications Module, 100BASE-TX Ethernet, DIN Rail mount, RJ45, CE/cULus approved.

$346.00Ref. price · indicative, final on quote
Omron CJ1W-ETN21 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

CJ1W-ETN21 — Identification
ParameterValue
SeriesCJ1W
CJ1W-ETN21 — Mechanical
ParameterValue
Mounting typeDIN Rail
Weight0.221 lb (100.24 g)
Termination styleRJ45
CJ1W-ETN21 — Approvals
ParameterValue
Approvals / certificationsCE, cULus, Lloyd, NK
CJ1W-ETN21 — Other specifications
ParameterValue
TypeCommunications Module

Product details

Communications gateway for CJ Series racks

The Omron CJ1W-ETN21 is a communications module that fits the CJ Series backplane, handling standard 100BASE-TX Ethernet (TCP/IP) traffic. It mounts to the DIN rail in the same slot pattern as other CJ1W modules, and termination is via the built-in RJ45 connector. Approved for use in panels requiring CE, cULus, Lloyd, or NK certification, so it suits marine and general industrial environments without additional paperwork.

DIN Rail mounting keeps alignment with neighboring CJ1W modules; the RJ45 port handles standard shielded or unshielded patch cables. The module is powered from the CJ backplane — no separate supply needed. Slot it into any free I/O slot on the rack, then set the IP address via the CX-Programmer or via the module's built-in web interface.

Frequently asked questions

What is the closest second-source if I have a CJ1W-ETN21 on the BOM?

The CJ1W-EIP21 shares the same mechanical footprint, DIN Rail mount, and RJ45 termination, but uses EtherNet/IP protocol instead of standard Ethernet/TCP. For a drop-in replacement you would need to reconfigure the network communication settings.

What is the type and series of this module?

It is a Communications Module in the CJ1W series.

Will the CJ1W-ETN21 drop into a panel specified around the CJ1W-EIP21?

Physically yes — same DIN Rail mount and RJ45 connector. However, the network protocol differs (TCP/IP vs EtherNet/IP), so the PLC program and network settings must be changed. No wiring changes needed.

What compliance documentation does this module carry?

It holds CE, cULus, Lloyd, and NK approvals. RoHS and REACH declarations are not listed in the available spec data; those would need to be confirmed with the manufacturer.

MPN
CJ1W-ETN21