ABB S800 I/O User Manual page 26

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The FCI and ModuleBus Modem are able to supervise the redundant voltage supply.
The supervision function is individually configurable for power supervision of each
I/O station.
Power
Supply
Power
Supply
16
A
B
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FCI
or ModuleBus Modem
24V
A
B
I/O station
24V d.c. power supply
Supervision 24V A, 24V B
I/O modules
3BSE 020 923R101