ABB S800 I/O User Manual page 106

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A fixed meaning is assigned to the colors red, yellow and green:
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For digital I/O on-states a definite meaning can not be assigned. For them the color
yellow is chosen. The
Fault; Error
Warning, I/O State Indications
and OSP (Outputs
Set as Predetermined)
Normal Operation
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For the location of LEDs the following rules are applied:
•
•
•
96
Danger or alarmWarning of potential danger or a situation which
requires immediate action
Caution
Safety
Table 5-1
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Indications having the same meaning on every I/O module (for example,
FAULT, RUN, WARNING, OSP) are at the same position.
The standard indications FAULT, RUN, WARNING and OSP (only output
modules), are always on the topmost position on every device (top: FAULT,
RUN, then WARNING, OSP).
On the FCI: FAULT, RUN, POWER OK, TRAFFIC and for redundant FCI
also PRIMARY and REDUNDANCY OK.
Change or impending change of condition, warning
Indication of a safe situation or authorization to
proceed, clear way.
shows the meaning and colors of LED's.
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Red "FAULT"
Yellow OSP, Process error,
Digital I/O on-state,
Process voltage low, Traffic.
Green "RUN", Normal operation,
Power OK.
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3BSE 020 923R101