Siemens 6ES7318-2AJ00-0AB0 PLC CPU Module — Legacy Replacement. Siemens 6ES7318-2AJ00-0AB0 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 318-2 DP, 512 KB work memory, (256 KB Code; 256 KB of data) 1st interface MPI 12 Mbit/s; 2 interface PROFIBUS-DP/MPI. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.