Siemens communication module cm 1241 series siemens 6es7241 1ch32 0xb0 the siemens 6es7241 1ch32 0xb0 is a cm 1241 communication board that is used for fast high performance serial data exchange via point to point connections point to point connection is possible via the rs422485 9 pin d sub female connection to simatic s7 automation systems or the systems of many other manufacturers including printers robot controls modems scanners and bar code readers etcthe communication board is