Siemens 6ES7403-1TA01-0AA0 Power Supply Module — Legacy Replacement. Siemens 6ES7403-1TA01-0AA0 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, extension rack ER1 with 18 slots, only for signal modules 2 redundant PS can be plugged in. The verified manufacturer lifecycle record is PM400: Legacy lifecycle record.