Johnson Controls, Inc. SLC Wiring Manual — P/N 51870:G 04/23/2009 15
SLC Capacity Introduction
1.6.11 ACPS-2406 Addressable Charger/Power Supply
The ACPS-2406 is an auxiliary power supply and battery charger. Each of its four Notification
Appliance Circuits (NAC) is individually addressable, eliminating the need for control modules. In
addition, each circuit can provide notification appliance synchronization. FlashScan and CLIP
capable.
1.6.12 AMPS-24/E Addressable Power Supply
The AMPS-24/E is a primary power supply and battery charger. Depending on its configuration, it
can occupy either one or four addresses on an SLC. FlashScan capable.
1.7 SLC Capacity
The protocol selected for an SLC loop determines the maximum number of devices that can be
handled by the loop (see Section 1.5, “Polling Protocols”, on page 11). Within those limits, the
individual control panel may have additional restrictions. See the specific installation manual for
this information.
1.8 SLC Performance
SLC performance (Style 4, Style 6, or Style 7) depends on the configuration of the circuit and the
components on the circuit (see Table 1.2). SLC operation meeting Style 7 requirements isolates
each addressable device on the SLC from faults that may occur on the SLC.
Wiring style requirements are determined by national and local codes. Consult with the Authority
Having Jurisdiction before wiring the SLC. The table below (derived from NFPA 72-2002) lists the
trouble conditions that result when a fault exists on an SLC. Additional information is broken out in
Section 2, “Wiring Requirements”, on page 17, and Section 3, “Shielded Wire Termination”, on
page 17.
Type of Fault Style 4 Style 6 Style 7
Single Open Trouble Alarm, Trouble Alarm, Trouble
Single Ground Alarm, Trouble (ground) Alarm, Trouble (ground) Alarm, Trouble (ground)
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
• Trouble - The control panel will indicate a trouble condition for this type of fault.
• Alarm - The control panel must be able to process an alarm input signal in the presence of this type of fault.
Table 1.2 SLC Circuit Configuration and Performance: Style 4, Style 6, Style 7
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