ABB S800 I/O User Manual page 62

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Cabinets erected side by side including a controller and I/O configuration are
regarded as a unit, and are connected to the a.c. (d.c.) power in one single
connection point, the centralized Power Switch unit. The switch unit is normally
located in the controller cabinet bay.
The power can be distributed to the I/O cabinets as required by the installed
equipment
Power
Supp.
Phase
Neutral
Ground
52
(Figure 2-20).
Cabinet 2
Cabinet 1
Controller
S800 I/O
Power
Switch
Cabinet
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Power
Supp.
Ground
3-wire cables
Power
Switch
Phase
Neutral
Enclosure
3BSE 020 923R101