ABB S800 I/O User Manual page 96

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Circuit breakers or a diode voting unit at the power supplies output are required
hot replacement of supplies is required
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Different power supply systems are available for the S800 I/O Station. The number
of power supply units is calculated with respect to actual number of S800 I/O
modules supported by the Station, see
for details.
Normally you don't have to deal with current consumption calculations, however
there are occasions with special requirements, or designs when detailed information
regarding current consumption is valuable. Please find a description of special
power supply usage under the guidelines below.
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Number of Power Supply Units/Power Consumption
The I/O Station requires 24V d.c. @ 1 amp for the FCI and 12 I/O modules.
Additional power may be required for field devices.
86
A summary of the main requirements of the plant supply, from a planning point
of view, is found in Section 2.1, Site
Auxiliary equipment in the controlled system is normally powered separately
from the S800 I/O power supplies.
If field devices are grounded, be sure to use galvanic isolation.
Heavy current on/off loads are
It is possible to use the system power supply for transmitters/transducers:
– There is idle capacity in the available power supply units
– The transducer is grounded directly in the control system chassis
Section 3.1.7, Power Supply Requirements
Planning.
powered separately
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3BSE 020 923R101