Siemens LOGO! 12/24RC - Page 175

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LOGO! Manual
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You can also generate a message via output Q4:
Q3
Fault
Q4
Message
The relay contacts of output Q4 are always closed when
the system is running. Relay Q4 does not release unless
there is a power failure or a fault in the system. This con-
tact can be used for teleindication, for example.
Applications