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P-Link Modules
P-Links modules such as the IDC-6, remote annunciators, and relay expansion boards (RLY-5) are connected to the main control
panel utilizing the four-wire P-Link bus for power and communication. This panel supports a maximum of thirty-one (31) P-Link
modules, which can be connected using a Class B or Class A wiring (examples are provided throughout this topic).
Note: P-Link Class A wiring requires the installation of a Class A Expander board (CA-4064). Instructions on installing the
CA-4064 are included in this section.
Configuration Characteristics
P-Link maximum current is 1A.
y
P-Link voltage rating is 16VDC - 27.2VDC Continuous
y
•
P-Link circuit is supervised and power-limited.
•
The maximum wire length is 6,500 feet.
Maximum Wire Resistance Formula
The maximum resistance is based on the load placed on the circuit. To calculate the maximum wire resistance, use the following
formula:
The worst case P-Link current draw cannot exceed the 1 amp. P-Link wiring gauges and lengths are calculated using the worst-
case current draw values from the table below. The worst case current draw numbers are used only for wiring calculations, refer to
the battery calculation worksheet for normal standby and alarm currents.
Table 6: P-Link Accessories Worst Case Current Draw (mA)
P-Link Accessory
PSN-1000
LED-4410G3
RLY-5
RA-4410G3
IDC-6
VFR-500 • 5403789 • REV A • 10/23
(Total P-Link Devive Current) x (Wire Resistance) < 3 Volts
Worst Case Current Draw (mA)
15
25
35
25
20
3-20
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