S7-400 power module

The power supply module of S7-400 provides 5V DC and 24V DC power supply to each module through the back board. Output current ratings are 4A, 10A, and 20A. PS 405 of the input for the DC voltage, PS 407 of the input for the DC voltage or AC voltage, S7-400 with a redundant function of the power module. If there is no interface module to transfer the 5V power supply, each extended frame needs a power supply module.