Siemens 6ES7440-1CS00-0YE0 Communication Processor — Legacy Replacement. Siemens 6ES7440-1CS00-0YE0 is the exact manufacturer order number for a communication processor in the SIMATIC S7-400 portfolio. Siemens describes this exact reference as: SIMATIC S7-400, coupling module CP 440-1 for point-to-point connections, 1 channel incl. configuration package on CD. The verified manufacturer lifecycle record is PM400: Legacy lifecycle record.