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CJ1W-EIP21

Omron CJ1W-EIP21 EtherNet/IP Unit for CJ Series PLC

SKU: CJ1W-EIP21

USD 270.00

Omron CJ1W-EIP21 is an EtherNet/IP communication unit for CJ series PLCs, enabling network connectivity for HMI and SCADA integration.

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Product Overview

The CJ1W-EIP21 extends CJ-series controllers with EtherNet/IP capability so machines can exchange cyclic and explicit messaging data with other automation devices. It is well-suited for plants standardizing on Ethernet-based architectures and for retrofits that require connecting legacy CJ control logic to newer networked components. With structured communication mapping and stable network behavior, this unit helps reduce protocol conversion layers and supports cleaner system-level diagnostics.

  • SKU: CJ1W-EIP21
  • Series: CJ1W

Best-Fit Applications

  • Linking CJ PLCs with EtherNet/IP-enabled VFDs and servo drives
  • Exchanging production status with line HMIs and dashboards
  • Connecting machine control to remote Ethernet I/O islands
  • Integrating older CJ-based equipment into modern plant networks
  • Publishing machine data upward to supervisory systems
  • Standardizing communication across mixed-vendor automation cells

Buying Checklist

  • Practical path to modernize networking without replacing CJ PLC core
  • Improves machine interoperability in Ethernet-first plants
  • Reduces integration time versus custom protocol gateways
  • Supports scalable architecture for future digitalization projects
  • Strengthens diagnostics and maintainability at system level

Technical Specifications

Model CJ1W-EIP21
Series CJ1W
Type EtherNet/IP Communication Unit
Ethernet Ports 1 port (10/100 Mbps)
Protocols EtherNet/IP, FINS/TCP, FINS/UDP
Connections Up to 128 simultaneous
IP Address Manual or DHCP
Data Links EtherNet/IP data links
Tag Data Links Producer/consumer model
Message Service Explicit messaging
Current Consumption 250mA at 5VDC
Operating Temperature 0 to +55°C
Mounting CJ series backplane

FAQ for CJ1W-EIP21

What's the difference between EIP21 and ETN21?
EIP21: EtherNet/IP protocol (open standard, Allen-Bradley compatible). ETN21: FINS/TCP protocol (Omron proprietary). Choose EIP21 for mixed-vendor networks, ETN21 for Omron-only systems.
Can this unit connect to Allen-Bradley PLCs?
Yes, EtherNet/IP is Allen-Bradley's native protocol. CJ1W-EIP21 can exchange data with ControlLogix, CompactLogix via producer/consumer tags or explicit messaging.
How many connections can this unit handle?
Up to 128 simultaneous connections: HMIs, drives, remote I/O, other PLCs. Sufficient for most applications. For more connections, add additional EIP21 units.
Can I program the PLC over EtherNet/IP?
Yes, CX-Programmer connects via EtherNet/IP using FINS/TCP protocol. Faster than serial connection. Allows remote programming and monitoring over network.

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