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Installation 15088:J 10/22/99
Section 4.2 The Loop Interface Boards (LIB-200, LIB-200A, and LIB-400)
The Loop Interface Boards (LIBs) allow the AM2020/AFP1010 to communicate with the system's alarm initiating
devices and to control the system's output devices.
Through a communications loop (functions in accordance with the requirements for NFPA SLCs or SLC loops),
the LIBs allow the control panel to communicate with addressable pull stations, and intelligent ionization,
photoelectric, and thermal detectors. Through addressable control modules (CMX/XPC) connected along the
communications loop, the control panel may selectively activate notification circuits or Form-C output relays.
Through addressable Monitor Modules MMX-1 and MMX-101, the control panel may monitor entire circuits of
N.O. contacts, alarm initiating devices such as manual pull stations, 4-wire smoke detectors, heat detectors,
waterflow and supervisory devices. MMX-2 may be used to monitor conventional 2-wire smoke detectors.
Through Isolator Modules (ISO-X) or isolator/detector mounting base, a string of intelligent addressable devices
and modules may be electrically "isolated" from the remainder of the communications loop, permitting critical
loop components to function in the event of a short circuit on the loop. The LIB boards are power-limited.
LIB-200
The LIB-200 (refer to Figure 4.2-1) is a single signaling line circuit board which supports up to 10,000 feet (3,048
meters) maximum of field wiring for Style 4 and up to 10,000 (3,048) maximum for Styles 6 and 7 on ports A and
B. The maximum loop resistance for Style 4 is 40 ohms on ports A and B and 40 ohms total for Styles 6 and 7.
If wiring for the LIB-200 leaves the building, one or more surge suppressors are required. Refer to the Surge
Supression portion of this section for information on surge suppressors that are approved for use with this FACP.
Figure 4.2-1 The LIB-200
P2
1
8
8 Connect to Earth Ground Using Supplied Cable
P2
7 SLC Loop Port B-
5 SLC Loop Port B+
3 SLC Loop Port A-
1 SLC Loop Port A+
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