Dear friends

What's the difference between "Redundant PS-400" and "Standard PS-400" series?

For example we have a redundant S7-400 configuration in a project with following PS and CPU:

What's the additional capabilities, If we use "Redundant PS-405" 6ES7405-0KR02-0AA0 ?

Dear mazdak,
Using Redundant power supplies means that you insert two power supplies on the S7-400 rack. This way is used to increase the availability of the system specially for frequently power loss systems. And in these non-stable systems, it's recommended to feed each power supply from a separite power source to increase the availability. When one of the power supplies down, the other one will take over the supply of power to the rack. There won't be loss of operation.

There are other features for using redundant power supplies. For more details, please have a look on the attached two sheets.

Hope this helps.