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CJ1W-ETN21

Omron CJ1W-ETN21 Ethernet Unit for CJ Series PLC

SKU: CJ1W-ETN21

USD 265.00

Omron CJ1W-ETN21 is an Ethernet communication unit for CJ series PLCs, enabling network connectivity for HMI and SCADA integration.

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Product Overview

CJ1W-ETN21 belongs to Omron CJ1W communication module family and is used to provide Ethernet-based connectivity for CJ-series PLC architectures. This unit is commonly selected in applications requiring supervisory integration, data exchange with external devices, and networked diagnostics. It is widely used in machine panels and utility systems where controller communications must be expanded without replacing the core PLC platform. Engineering should validate IP planning, network topology, traffic behavior, and data mapping to ensure stable performance. Commissioning should include communication stress checks, connection recovery tests, and alarm handling for network faults. CJ1W-ETN21 is typically chosen for maintainable Ethernet integration in long-life industrial control installations.

  • SKU: CJ1W-ETN21
  • Series: CJ1W

Best-Fit Applications

  • PLC integration with SCADA/host systems
  • Data exchange with networked machine subsystems
  • Remote diagnostics in distributed automation cells
  • Retrofit communication upgrades in CJ installations
  • Production status reporting across plant networks
  • Structured Ethernet connectivity in OEM controller designs

Buying Checklist

  • Confirm network protocol and architecture requirements.
  • Plan IP addressing and segmentation before deployment.
  • Validate data update rates and connection load behavior.
  • Test communication fault recovery under real conditions.
  • Maintain clear network documentation for support teams.

Technical Specifications

Model CJ1W-ETN21
Series CJ1W
Type Ethernet Communication Unit
Ethernet Ports 1 port (10/100 Mbps)
Protocols FINS/TCP, FINS/UDP, Socket Service
Connections Up to 8 simultaneous
IP Address Manual or DHCP
Data Links Ethernet data links supported
Email Email notification supported
FTP FTP server/client supported
Web Server Basic web server
Current Consumption 200mA at 5VDC
Operating Temperature 0 to +55°C
Mounting CJ series backplane

FAQ for CJ1W-ETN21

What HMIs can connect to this Ethernet unit?
Any HMI supporting FINS/TCP: Omron NS/NB/NA series, third-party HMIs with FINS driver (Wonderware, Ignition, etc.). Also supports Modbus TCP with gateway.
Can I program the PLC over Ethernet?
Yes, CX-Programmer connects via Ethernet using FINS/TCP protocol. Faster than serial connection. Allows remote programming and monitoring over network.
How do I set up email notifications?
Configure SMTP server settings in unit setup. Define trigger conditions (faults, alarms) in PLC program. Unit sends email when trigger occurs. Useful for remote monitoring and alerts.
What's the difference between ETN21 and EIP21?
ETN21: Ethernet with FINS/TCP protocol (Omron proprietary). EIP21: EtherNet/IP (open standard, Allen-Bradley compatible). Choose ETN21 for Omron systems, EIP21 for mixed-vendor networks.

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