Potter PFC-6075R - Manual (Page 37)

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PFC-6075R • 5403594 • REV D • 9/14
P-Link Devices
Accessory devices, such as remote and LED annunciators, and the relay expansion board (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 64 P-Link
devices, which can be connected using a Class B or Class A wiring style (examples are provided throughout this topic).
Note: If you have chosen to install an optional PSN-1000/PSN-1000(E) power expansion board, refer to Section 6:
PSN-1000/PSN-1000(E) – Installing, Operating & Programming, for instructions on installing this appliance.
Configuration Characteristics
y y P-Link current rating is one (1) amp.
y y P-Link voltage rating is 24 VDC.
y y 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:
(Total Annunciator Alarm Current) x (Wire Resistance) < 6 Volts
Figure 32. P-Link Class B Wiring Example
To the next device
-
+
A
B
Expansion
Device
-
+
A
B
P-LINK
- + A B
Panel
Connection
Expansion
Device
DWG #602-11A