5.3.2 Relay for fault and alarm (RT activation)
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Assignment of connection terminals on periphery board (identical for FC722 and
FC724). Permitted cable cross-section: 0.2...1.5 mm
FC722 and FC724
Break contact fault (normally closed)
Center tap fault (common)
Make contact fault (normally open)
Break contact alarm (normally closed)
Center tap alarm (common)
Make contact alarm (normally open)
The relays can be used e.g. for non-monitored activation of remote transmission
equipment 'RT' (e.g. phone dialing equipment).
Fault relay (inverse operation)
The fault relay is activated when at least one station fault has been detected. This
relay is activated when the control panel is in idle mode (, NC, inverse operation).
In the event of a fault message, the relay changes the switching condition (to C,
NO). Thanks to inverse operation, a fault message will still be sent in the event of
the station losing all power.
+ Ub (DC)
The alarm relay is activated when at least one station alarm message has been
Example of connection with external signal transmitter, e.g. an optical normal
operation/alarm message display.
+ Ub (DC)
Connection to an external monitoring
Connection of external control
voltage e.g. for an acoustic or optical
fault message (example)
Max. 24 V DC/1 A
Max. DC 24 V / 1 A