Page 78 AFP-2800 - Fire Indicator Panel – Appendix
© N
OTIFIER
I
NERTIA
P
TY
L
TD
, 2001
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INERTIA
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COM
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AU
Style 7. (Closed loop with isolation modules providing a redundant path for short circuit conditions)
Total Loop, 3810M maximum, 50 Ohms resistance maximum.
Maximum of 25 devices between isolation modules (Note: contact Notifier Inertia for details)
In style 7, the processor polls the loop from one of the drivers (the B-side). If a failure (short circuit) occurs
between two isolation modules, or the A or B ports of the LCM and an isolation module, the shorted section of loop
will be isolated and the processor will poll through both ends. Note that the A and B ports of the LCM also provide
short circuit isolation.
Two wire addressable detector
Addressable moduleBranch A
Branch B
A
+
A-
B
-
B+
To LCM or LEM
STYLE 4
Two wire addressable detector
Addressable module
Loop Out
Loop Return
A
+
A-
B
-
B+
To LCM or LEM
STYLE 6
Two wire addressable detector
Addressable module
Loop Out
Loop Return
A+
A-
B-
B+
To LCM or LEM
ISO-X
ISO-X
Isolation module
STYLE 7
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