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

The Original New Omron CJ1W-EIP21 is an EtherNet/IP unit for the SYSMAC CJ series programmable logic controller (PLC) platform, designed to connect production sites to information networks via EtherNet/IP protocol. Equipped with a single RJ45 socket supporting 100Base-TX (100 Mbit/s) and 10Base-T (10 Mbit/s), it provides high-speed data exchange between PLCs, host computers, HMIs, and other Ethernet devices. Featuring a massive 184,832-word tag data link capacity, this unit enables flexible, large-scale data sharing across up to 256 nodes using 256 connections—9 times the capacity of previous OMRON models. Part of the CJ-series CPU Bus Unit family, it is compatible with CJ1, CJ2, NJ-series, CP1H, and NSJ series PLCs.

⚠️ Important Product Status Note:

This product has been discontinued by Omron as of March 2025 (last order date: March 31, 2025). The recommended replacement is the CJ1W-EIP21S (improved security functions). For new designs, please consider the recommended replacement model.

Core Engineering Highlights:
EtherNet/IP tag data link capacity: 184,832 words max (180,000+ words) | 256 connections per unit | 256 tag sets | 0.5–10,000 ms packet interval (refresh cycle) | 100Base-TX/10Base-T auto-negotiation | 1 x RJ45 Ethernet port | FINS/UDP & FINS/TCP message communications | CIP message service (Class 1, 2, 3) | 410 mA current consumption at 5 V DC | 31 × 90 × 65 mm (W × H × D) | 94 g max weight

Key Features:

• Original New Omron CJ1W-EIP21 EtherNet/IP unit

• Massive tag data link capacity: 184,832 words max (up to 722 CH per node)

• 256 connections and 256 tag sets for large-scale data exchange

• CIP communications support: Tag data links (cyclic communications), CIP message communications

• FINS message communications via UDP/IP or TCP/IP with host applications or CX-Programmer

• 0.5–10,000 ms packet interval, independently settable per connection

• 100Base-TX (100 Mbit/s) and 10Base-T (10 Mbit/s) auto-negotiation

• Single RJ45 Ethernet port for network connectivity

• Units per CPU: NJ-series: 4 max., CJ-series: 8 max., CP1H: 2 max.

• Mounts on CPU rack or expansion rack (CJ-series CPU Bus Unit)

• 31 mm width for space-saving installation

• High-speed, high-capacity data link for large-scale system networking

• Non-volatile memory stores Unit settings (IP address, DNS, FINS/UDP/TCP settings)

• UC1, N, L, CE certified

Applications:

• Factory automation network integration for CJ-series PLCs

• High-speed, large-volume data exchange between PLCs and host computers, HMIs, or SCADA systems

• Multi-vendor device communication using standard CIP protocol

• Machine control and manufacturing automation systems

• Process control and data acquisition networks

• Remote monitoring and control via EtherNet/IP

• Production line data sharing across multiple nodes

Technical Specifications:

System Compatibility:

• Compatible with Omron SYSMAC CJ1, CJ2, NJ-series, CP1H, and NSJ series PLCs

• Uses CJ-series I/O bus

• Mounts on CPU rack or expansion rack

• CJ2H-CPU6[]-EIP: up to 7 units per CPU

• CJ2M CPU Unit: up to 2 units per CPU

• NJ-series CPU Unit: up to 4 units per system

• Requires unit version 2.1 or later to connect to NJ-series CPU Unit

• Programming software: CX-Programmer (CX-One), CX-Integrator

• Recommended network device: Switching Hub (W4S1-05D)

Related Products:

• CJ1W-EIP21S – Recommended replacement (enhanced security functions)

• NX102-9000 – NX-series replacement option

• W4S1-05D – Industrial Switching Hub, 5 ports, recommended network device

• CJ1W-PA205R – Power supply unit, 100-240 V AC, 25 W, with RUN output

• CJ1W-ID211 – 16-point DC input unit

• CJ1W-OD212 – 16-point PNP transistor output unit

• CJ1W-OC211 – 16-point relay output unit

• CJ2M-CPU32 – CPU unit with built-in EtherNet/IP

• CX-Programmer – Programming software for CJ-series PLCs

• CX-Integrator – Network configuration tool

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Omron and SYSMAC are trademarks of Omron Corporation.