Wiring a Signaling Line Circuit (SLC)
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AFP-300/AFP-400 Installation PN 50253:C1 05/22/97 2-41
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SLC performance depends on the type of circuit: Style 4, Style 6, or Style 7. Table 2-17
lists the trouble conditions that result when a fault exists on an SLC.
Table 2-17 SLC Performance
Fault in Loop Style 4 Style 6 Style 7
Open Trouble Alarm/Trouble Alarm/Trouble
Ground Alarm/Trouble Alarm /Trouble Alarm/Trouble
Short Trouble Trouble Alarm/Trouble
Short and open Trouble Trouble Trouble
Short and ground Trouble Trouble Alarm/Trouble
Open and ground Trouble Alarm /Trouble Alarm/Trouble
Communications loss Trouble Trouble Trouble
•
Trouble
indicates a trouble signal will be generated at the control panel during the
abnormal condition.
•
Alarm/Trouble
indicates an alarm signal can be transmitted to the control panel during
the abnormal condition.
• SLC operation meeting Style 7 requirements isolates entire physical zones on the SLC
from faults that occur within other areas of the SLC.
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