ABB REF 54 Series Operator's Manual page 32

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Operator's Manual
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Interlocking is used to inhibit the close or open command to a controllable object in
certain situations. The interlocking program of RE_ 54_ operates according to the
permission principle, i.e. any control operations not enabled by interlocking are
inhibited.
When an object is selected with the [select] button, the assisting window shows the
status of the interlocking program. The downmost LED of the programmable LED
indicators is reserved for the interlocking function.
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Neither interlockings nor active control test mode
Control test mode active (interlocking bypass)
Control command has been inhibited (interlocked or blocked)
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