Siemens 6ES7954-8LC03-0AA0 - CPU 1510SP-1 PN for ET 200SP Work memory 100 KB for program and 750 KB for data 1 integrated port and 2 via BusAdapter
Siemens 6ES7137-6AA00-0BA0 - Communication module for serial connection RS422, RS485 and RS232, Freeport, 3964 (R), USS, MODBUS RTU Master, Slave, 115200 Kbit/s
Siemens 6ES7137-6AA01-0BA0 - Communication module for serial connection RS422, RS485 and RS232, Freeport, 3964 (R), USS, MODBUS RTU Master, slave, max. 250 Kbit/s, suitable for BU type A0