OVERVIEW

Official designation: Omron CJ1W-EIP21 (CJ1, EtherNet/IP Unit)

Role/Application: A CJ-series CPU Bus Unit providing a high-capacity EtherNet/IP interface for real-time control, data exchange, and simultaneous use of Tag Data Link and FINS/TCP/UDP services.

KEY SPECS SUMMARY

Power: 410 mA max at 5 VDC

Interfaces / Ports: One RJ45 connector, 100Base-TX

Indicators: MS, NS, Link/Activity LEDs

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: Omron CJ, NJ, CP1H, and NSJ PLCs

Limit: 256 connections, 722 words per connection

Lifecycle: Active, CE/UL/cULus approved

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the maximum transmission distance and recommended cable type for the 100Base-TX port?

A: The transmission distance is 100 m max between node and hub using shielded twisted-pair Category 5 or 5e cable.

Wiring & Installation:

Q: What is the recommended network topology and is there a limitation on cascade connections when using a switch?

A: The recommended topology is star form, and there is no limitation on cascade connections when using a switching hub.

Troubleshooting & Compatibility:

Q: Which protocols are supported for message communications and what is the maximum number of FINS/TCP connections?

A: The unit supports CIP Class 3 Explicit Messaging and FINS/TCP, with a maximum of 16 FINS/TCP connections.

Replacement & Upgrades:

Q: What steps should be followed when updating the firmware on the EtherNet/IP Unit?

A: Set the CPU Unit to program mode and do not interrupt power to the PLC or computer during the firmware update procedure.