This object indicates the state of power supply redundancy mode.
When on(1), N+1 mode redundancy is enabled(default mode). In
this mode the system controls the power supplies to maintain
efficient use of the power supplies, with 1 extra power supply
in case of a power supply failure. Unneeded power supplies are
powered off. It can be set to off(2) to disable redundancy mode.
In this mode all power supplies are powered on.