Omron CS1W-ETN21 Ethernet Module CS1WETN21

Description:

The Omron CS1W‑ETN21 Ethernet module is used in industrial automation systems to provide Ethernet communication capabilities for programmable logic controllers (PLCs). Commonly installed in Omron CS‑Series PLC racks for networking, data exchange, and remote monitoring in automated machinery and control systems. Maintenance teams and system integrators use this module for system networking upgrades, Ethernet I/O integration, and replacement of legacy communication interfaces.

Applications:

The Omron CS1W‑ETN21 module is widely used in industrial control environments requiring reliable Ethernet connectivity between PLCs, HMIs, and supervisory systems. It is commonly found in factory automation, process control lines, packaging equipment networks, material handling systems, and distributed control systems where high‑speed Ethernet communication enables remote data access, system diagnostics, and integration with SCADA platforms.

Technical Specifications:

• Model: CS1W‑ETN21
• Function: Ethernet communication interface module for CS‑Series PLCs
• Protocols supported: TCP/IP, UDP, Modbus/TCP, EtherNet/IP (model dependent)
• Port type: RJ45 10/100 Mbps Ethernet port
• Networking: PLC‑to‑PLC and PLC‑to‑HMI/SCADA communication
• Connection: Single Ethernet port per module
• Mounting: Omron CS1 PLC rack slot mount
• Compatibility: Omron CS1, CJ1, and related PLC systems
• Indicators: LED status indicators for Link/Activity/Errors
• Power: Supplied through PLC backplane
• Communication distance: Standard Ethernet cabling (Cat5/6)
• Diagnostic capability: Network status and error reporting via PLC
• Designed for: Industrial automation networking

Common Replacements:

• Omron CS1W‑ETN31 (enhanced Ethernet module)
• Omron CJ1W‑ETN21 (Ethernet for CJ1 PLCs)
• Omron NX‑EK2 (Ethernet communication module)