AFP-400 Installation
PN
50253
:
A2 03/12/96
2-45
Wiring a Signaling Line Circuit (SLC)
SLC Overview
Communication with intelligent and addressable initiating, monitor and control
devices occurs through a Signaling Line Circuit (SLC) Loop. You can wire an SLC
loop to meet the requirements of NFPA Style 4, Style 6, or Style 7 circuits. The
following table covers the types of devices that you can use in SLC circuits.
Type of Device
SLC Function
Isolator Modules
(ISO-X)
Allows a zone of detectors and modules to be
electrically isolated from the remainder of the loop,
which lets critical loop components function if a
circuit fails. ISO-X modules are required for NFPA
Style 7 circuits.
Addressable Monitor
Modules (MMX series)
Allows the control panel to monitor entire circuits of
conventional, alarm initiating devices, such as manual
pull stations, detectors, waterflow and supervisory
devices. The BGX-101L (a type of monitor module)
provides point annunciation of manual pull stations.
Control Modules
Allows the control panel to selectively activate
notification circuits or Form-C output relays.
Intelligent Detectors
Allows the control panel to communicate with
intelligent ionization, photoelectric, and thermal
detectors on the loop.
Refer to the installation
drawings supplied with
each loop device for
rating and specification
information.
Communications Loop Performance
Device Capacity
Loop performance depends on the type of circuit: Style 4, Style 6, or Style 7.
The Communications Loop Performance table lists the trouble conditions that
result when a fault exists on a communications loop. The following notes apply
to the table.
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.
Loop operation meeting Style 7 requirements isolates entire physical zones on
the communications loop from faults that occur within other areas of the
communications loop.
Loop Performance
Control panel capacity includes up to 198 intelligent detectors, and an addi-
tional combination of up to 198 addressable pull stations, control modules and
monitor modules. In addition, the control panel also supports four Notification
Appliance Circuits and up to 99 programmable relays.
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