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OVERVIEW
Official designation: Omron CJ1W-ETN21 (CJ1W, Ethernet Unit)
Role/Application: Ethernet communications module integrating CJ-Series PLCs into an information network using FINS/TCP, FINS/UDP, FTP, and standard UDP/TCP protocols.
KEY SPECS SUMMARY
Power: 370 mA max. at 5 VDC
Interfaces / Ports: One RJ45 8-pin connector
Indicators: RUN, ERR/ALM, SD, RD, 100M, LINK LEDs
Operating Temp: 0 degrees C to 55 degrees C
Platform / Compatibility: Omron CJ-series, CPU Bus Unit
Limit: 100 Mbit/s, 100 m distance, 254 FINS nodes
Lifecycle: Discontinued
FREQUENTLY ASKED QUESTIONS
Technical Specifications:
Q: What are the supported Ethernet protocols and media access method for the unit?
A: Protocols include FINS/TCP, FINS/UDP, and EtherNet/IP; CSMA/CD access method is used.
Wiring & Installation:
Q: What are the required cable categories and maximum transmission distance between nodes?
A: Category 5 or 5e UTP/STP cable is required, with a maximum distance of 100 m.
Troubleshooting & Compatibility:
Q: What is the significance of the ERH flashing LED on the Ethernet unit?
A: The ERH LED indicates an error, often due to an address disagreement or configuration fault.
Replacement & Upgrades:
Q: What is the lifecycle status of the CJ1W-ETN21, and is there a recommended replacement?
A: The unit is officially discontinued; replacement information should be verified with the manufacturer.
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| Model Name | See this page for details |
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| Country of Manufacture or Origin | See this page for details |
| Manufacturer | See this page for details |
| After-sales Service Contact or Customer Support Number | See this page for details |
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