Siemens 6ES7340-1CH02-0AE0 Communication Processor — Legacy Replacement. Siemens 6ES7340-1CH02-0AE0 is the exact manufacturer order number for a communication processor in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: ***spare part*** SIMATIC S7-300, CP 340 communications processor with RS-422/485 interface incl. configuration package on CD. The verified manufacturer lifecycle record is PM410:Product cancellation.