Notifier AFP-2800 Operation, Installation & Programming Manual page 117

Style 7. (Closed loop with isolation modules providing a redundant path for short circuit conditions)
Total Loop, 3810m maximum, 50 Ω resistance maximum.
Maximum of 25 devices between isolation modules (Note: contact Notifier more 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.
Loop Return
Loop Out
B+ B- A- A+
AFP-2800/2802 Manual – P/N 11249 11-Mar-08
Branch B
Branch A
To LCM or LEM
B+ B- A- A+
Loop Return
Loop Out
To LCM or LEM
B+ B- A- A+
Two wire addressable detector
Addressable m odule
To LCM or LEM
Two wire addressable detector
Addressable module
STYLE 4
Two wire addressable detector
Addressable module
STYLE 6
ISO-X
Isolation module
ISO-X
Appendix
STYLE 7
115