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Wiring a Signaling Line Circuit (SLC)
2-56 AFP-300/AFP-400 Installation PN 50253:C1 05/22/97
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Figure 2-75 shows a supervised and power-limited NFPA Style Y NAC using a CMX
module. This shows polarized alarm notification appliances connected to CMX
modules in a two-wire configuration. A CMX module can control 2 A of resistive load
(on electronic devices) or 1 A of inductive load (on mechanical bells and horns). If
installing more than one CMX NAC, install the power supervision relay on the 24 VDC
power bus after the last CMX.
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• Do not T-tap or branch a Style Y circuit.
• Terminate the circuit across the last device using a 47K, 1/2-watt ELR
(PN ELR-47K).
• Do not run wiring under any terminals. To maintain supervision, break the wire
run.
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Connect the NAC as follows:
1. Connect the SLC to CMX terminals 1 (–) and 2 (+).
2. Connect 24 VDC power to MPS-400 TB2 (Figure 2-75).
3. Set the CMX rotary switches to the required SLC address. (The CMX takes one
module address on the SLC.) For instructions on setting rotary switches, see
Figure 2-68 on page 2-49.
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