Siemens 6ES7241-1CH30-1XB0 Communication Board

Siemens 6ES7241-1CH30-1XB0 is a SIMATIC S7-1200 Communication Board (CB 1241) that adds an RS-485 serial interface to compatible S7-1200 CPUs. The module mounts on the front of the CPU and uses a terminal block for the RS-485 wiring, delivering a dedicated bus port for industrial serial networks. It supports Modbus RTU Master and Modbus RTU Slave, ASCII, and USS protocols, with Freeport as an integrated driver, enabling flexible data exchange with Modbus devices, HMIs, and other PLCs. In Freeport configurations, cable lengths up to 1,000 meters are supported, making it suitable for distributed automation segments. This CB 1241-based board is designed to extend the S7-1200’s communication capabilities specifically through RS-485, offering a compact, standards-aligned solution for applications requiring reliable serial communication in factory and process environments.