ABB S800 I/O User Manual page 109

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Voltage failure, component fault or manual restart usually affect the control system
function. I/O system failure affects the process in different ways:
• In a system which is monitoring the process only, changes in the process status
are not registered but there is no immediate danger to the process operation.
• In a system which is controlling a continuous processes (rolling mills and paper
manufacture) demands a high degree of continuity of the control system
functions.
A restart of the I/O system or controller can have very serious consequences. It is
important to be aware of the local requirements for safety when starting and
stopping the I/O system or controller.
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The CI810/CI830, CI820 Fieldbus Communications Interface (FCI), or TB820
status LED - P is illuminated when 24V d.c. is supplied to the FCI, and 5V (from the
FCI) is supplied to the rest of the I/O Station.
The supply system consists at least of one power supply.
Power can be checked at the FCI or TB820 on terminals L+ and L- with a voltmeter.
The value should be 24V d.c. (19.2 to 30). Power can also be checked at the power
supply or on the distribution strip.
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The CI810/CI830, CI820 Fieldbus Communications Interface (FCI), or TB820
status LED - P is illuminated when 24V d.c. is supplied to the FCI, and 5V (from the
FCI) is supplied to the rest of the I/O Station.
The supply system consists at least of two power supplies.
Power can be checked at the FCI or TB820 on terminals L+ and L- with a voltmeter.
The value should be 24V d.c. (19.2 to 30). Power can also be checked at the power
supplies, diode unit or on the distribution strip.
To do a complete check each power supply has to be run as single.
3BSE 020 923R101
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