6ES7312-1EA14-0AB0 SIMATIC S7-300, CPU 312 Central processing unit with MPI, Integr. power supply 24 V DC, Work memory 32 KB, Micro Memory Card required
6ES7312-1AD10-0AB0 Siemens SIMATIC S7-300 CPU 312 Standard Controller with 1 x RS-485 Interface (MPI), 16 KBytes Memory for User Program and Data, No Integrated I/O, Integrated 24V DC Power Supply, required Micro Memory Card