Installation Wiring a Signaling Line Circuit (SLC)
48 IQ-301 PN 50036:F 10/29/2001
Figure 28 shows typical wiring for a supervised and power-limited four-wire SLC that
meets NFPA 72 Style 6 requirements.
CAUTION: Terminate shield drain wire according to the instructions in “SLC
Shield Termination” on page 43.
Note: ISO-X devices are not required to meet NFPA Style 4. You can install a
maximum of 25 devices, detectors, and modules between isolator modules, or isolator
detector mounting base.
Figure 28 Typical Four-wire SLC Circuit (Style 6)
!!
TB4
TB5 TB6
TX REF RX REF
OUT OUT IN IN
1 2 3 4 5 6
A B B+ A+ B- A-
2(+)
1(-)
3
LOOP ADDRESS
TY PE
Low
Med
High
1
2
3
4
1
2
3
4
1 2 3 4
90
81
72
63
54
-
+
+
-
90
81
72
63
54
-
+
+-
CPU
Connect SLC Out to TB 6-3 (+) and TB 6-5 (–).
Connect SLC Return to TB 6-4 (+) and 6-6 (–).
B710LP Detector Base
Use with FSP, FSI, and FST
Series intelligent detectors
no connection
NBG-12LX
Monitor ModuleControl or Relay
Module
Loop Isolator Module Loop Isolator Module
AFP200-SLC-6.cdr
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