Siemens 6BK1942-0BA00-0AA0 SIPLUS HCS4200 RACK4200 FOR INTEGRATION OF MAX. 4 POWER MODULES (POM) POM4220. EACH POWER OUTPUT MODULE IS CONNECTED VIA DIRECT CONNECTOR ON A BUS BOARD, WHICH IS MOUNTED ON THE REAR OF THE SUBRACK. THE COMMUNICATION TO THE PLC