Omron C120-LK201-EV1 Host Link Unit PLC Communication Module

The Omron C120-LK201-EV1 Host Link Unit is a PLC communications module for Omron C-series controllers that enables bidirectional serial data exchange between the PLC and external devices such as HMIs and computers. Used in control panels, manufacturing systems, and process automation lines, it communicates over RS-232C and RS-422A via the Omron Host Link protocol through a dedicated port. The module is rack-mounted, power is supplied through the PLC backplane, and it provides LED status indicators to monitor operation. It is compatible with Omron C-series PLCs and is commonly used to connect operator interfaces, supervisory systems, and peripheral devices for reliable data exchange in factory automation and production environments. Common replacements include the Omron C500-LK201, C200H-LK201, and CJ1W-SCU21.