Siemens 6ES7241-1CH30-1XB0 SIMATIC S7-1200 Communication Board
The Siemens 6ES7241-1CH30-1XB0 is a SIMATIC S7-1200 Communication Board CB 1241, a compact add-on that plugs directly onto the front of an S7-1200 CPU to add RS485 serial communication. It doesn't take up any extra panel space since it mounts on the CPU itself rather than the DIN rail. It supports several serial protocols, including Freeport, ASCII, and Modbus RTU, making it a flexible option for connecting to third-party devices, drives, and sensors.


