Ann-Bus Devices; Ann-Bus Wiring; Calculating Wiring Distance For Ann-Bus Modules - Honeywell fire-lite alarms MRP-2002E Manual

Installation

2.7 ANN-BUS Devices

WARNING! Disconnect all sources of power (AC and DC) before installing or removing any
modules or wiring.
A variety of optional devices can be connected to the FACP ANN-BUS communication circuit.
Compatible devices include:
• ANN-80 LCD Annunciator
• ANN-S/PG Serial/Parallel Printer Interface Module
• ANN-I/O LED Driver Module
• ANN-LED Annunciator Module (annunciates alarms, troubles and supervisories)
• ANN-RLY Relay Module

2.7.1 ANN-BUS Wiring

This section contains information on calculating ANN-BUS wire distances and the types of wiring
configurations (Class B).

2.7.1.1 Calculating Wiring Distance for ANN-BUS Modules

The following instructions will guide the installer in determining the type of wire and the
maximum wiring distance that can be used with FACP ANN-BUS accessory modules.
To calculate the wire gauge that must be used to connect ANN-BUS modules to the FACP, it is
necessary to calculate the total worst case current draw for all modules on a single 4-conductor
bus. The total worst case current draw is calculated by adding the individual worst case
currents for each module. The individual worst case values are shown in the following table:
ANN-S/PG Serial/Parallel Printer Interface Module
Note: Total worst case current draw on a single ANN-BUS cannot exceed 0.5 amp.
30
Model Number
ANN-80 LCD Annunciator
ANN-I/O LED Driver Module
ANN-LED Annunciator Module
ANN-RLY Relay Module
ANN-BUS Devices
Worst Case Current Draw
0.040 amps
0.040 amps
0.200 amps
0.068 amps
0.075 amps
MRP-2002 & MRP-2002E PN 53049:A1 5/01/2008