IDEC FL1E-H12RCA User Manual page 294

Applications
You can also generate a message at output Q4:
The relay contacts of output Q4 are always closed when the
system is in operation. Relay Q4 does not drop off unless
there is a power failure or a fault in the system. This contact
can be used for remote monitoring, for example.
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Q3
Q4
Error Messege
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