Siemens 6ES7312-1AE13-0AB0 PLC CPU Module — Legacy Replacement. Siemens 6ES7312-1AE13-0AB0 is the exact manufacturer order number for a plc cpu module in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: ***Spare part*** SIMATIC S7-300, CPU 312 Central processing unit with MPI, Integr. power supply 24 V DC, Work memory 32 KB, Micro Memory Card required. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.