Omron CS1W-SCU21-V1 Serial Communications Unit

The Omron CS1W-SCU21-V1 Serial Communications Unit is a two-port module for CS1W Series PLCs that enables high-speed bidirectional serial communications with external devices. It supports RS-232C, RS-422A, and RS-485 interfaces and offers Host Link, No-protocol, and custom serial communication options, making it suitable for connecting PLCs to HMIs, operator interfaces, barcode readers, and other serial equipment in control panels, factory automation, material handling systems, and production lines. Mounted in the PLC rack and powered via the PLC backplane, this unit provides two independent serial ports with LED indicators for communication and module status, and is designed for 0°C to +55°C operation. Compatible with Omron CS1 Series PLCs, it is widely used to maintain stable data exchange in PLC-based systems. Common replacements include Omron CJ1W-SCU21-V1, Omron CS1W-SCU31-V1, and Omron CP1W-CIF11.