Omron CJ1W-EIP21 CJ Series EtherNet/IP Unit 100BASE-TX

Omron CJ1W-EIP21 is an EtherNet/IP unit for the SYSMAC CJ series PLC system. Connects CJ series PLCs to an EtherNet/IP network. Supports CIP (Common Industrial Protocol) communications, tag data links, and FINS message communications (FINS/UDP, FINS/TCP). Maximum tag data link capacity of 184,832 words enables large-capacity, program‑free data exchange between up to 256 nodes using 256 connections. Single RJ45 port, 100BASE-TX (auto‑negotiation, also usable as 10BASE‑T). Mounts on CPU Rack or Expansion Rack as a CJ-series CPU Bus Unit.

Applications:

• High‑capacity tag data links between CJ-series PLCs and EtherNet/IP devices

• CIP messaging with industrial controllers, HMIs, drives, and I/O systems

• Factory automation Ethernet backbone for data exchange and remote monitoring

• Integration into multivendor EtherNet/IP networks (robots, safety devices, sensors)

Core Specifications:

• Product type: CJ‑series CPU Bus Unit (EtherNet/IP Unit)

• Communication port: 1 × RJ45

• Network standard: 100BASE‑TX (10BASE‑T supported)

• Supported protocols: CIP (tag data links, messaging), FINS/UDP, FINS/TCP

• Tag data link capacity: up to 256 connections, 722 words/connection, total ≤184,832 words

• Message communications: FINS, CIP explicit messages

• Unit number setting: Rotary switch (0‑F)

• Current consumption: 410 mA max. at 5 V DC

• Weight: 94 g max.

• Dimensions (W × H × D): 31 mm × 90 mm × 65 mm

• Operating temperature: 0 °C … 55 °C

Advanced Specifications:

• Tag data link settings stored in unit non‑volatile memory (no CPU Bus Unit Setup Area used)

• Configuration: Network Configurator software

• Transmission media: Shielded twisted‑pair (STP) Cat 5, 5e, 100 Ω

• Transmission distance: 100 m (hub to node)

• Mounting location: CPU Rack or Expansion Rack (CJ I/O bus)

• Permissible units per CPU Unit: depends on CPU (CJ2H: 7 max., CJ2M: 2 max., NJ: 4 max.)

• Certifications: UC1 (cULus Class I Div 2), NK, Lloyd, CE

System Integration:

• This EtherNet/IP unit belongs to the Omron SYSMAC CJ series.

• Compatible with NJ‑series, CJ‑series (CJ1, CJ2), CP1H, and NSJ series PLCs.

• Up to 8 units per CJ system (including Expansion Racks), up to 4 units per NJ system.

• Uses same operating procedures as DeviceNet for configuration, monitoring, and program transfer.

• For detailed installation (unit number setting, wiring, IP address configuration) and tag data link setup, refer to the product hardware manual.

Related Products (logical chain):

• CJ1W‑EIP21S – same form factor with enhanced security functions

• CS1W‑EIP21 – CS‑series EtherNet/IP Unit

• CJ2M‑CPU31/32/33/34 – CJ2 CPU units with built‑in EtherNet/IP port

• Network Configurator – configuration software for tag data link setup