Siemens 6ES7403-1TA11-0AA0 Power Supply Module — Legacy Replacement. Siemens 6ES7403-1TA11-0AA0 is the exact manufacturer order number for a power supply module in the SIMATIC S7-400 portfolio. Siemens describes this exact reference as: SIMATIC S7-400, ext. rack ER1 aluminum, with 18 slots, for signal modules, 2 redundant PS can be plugged in. The verified manufacturer lifecycle record is PM400: Legacy lifecycle record.