
Power supply modules
3.2 Redundant power supply modules
S7-400 Automation System Module Data
52 Reference Manual, Edition 09/2009, A5E00850736-06
● The failure of a power supply module is registered via a plug and remove interrupt
(default STOP). If used in the second segment of the CR 2 no message is sent if the
power supply module fails.
● If two power supply modules are inserted but only one is switched on, there is a power-up
delay of up to one minute when the line voltage is switched on.
Note
The check box "Startup if preset configuration not equal to actual configuration" should be
activated in the "Properties" dialog box of the CPU.
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