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ANN-BUS Devices
2.8 ANN-BUS Devices
WARNING: RISK OF ELECTRICAL SHOCK
!
DISCONNECT ALL SOURCES OF POWER (AC AND DC) BEFORE INSTALLING OR REMOVING ANY MODULES OR
WIRING.
Guidelines
•
A variety of optional annunciation devices can be connected to an ANN-BUS communication circuit. ANN Series devices can be
connected to the primary communication circuit (EIA-485) terminals on TB3. A secondary communication circuit (EIA-485) for
these devices is available at TB1 on the ANN-SEC card.
•
When using one ANN-BUS circuit, up to eight (8) annunciators can be supported.
•
When using both ANN-BUS communication circuits, the primary circuit supports up to three (3) annunciators and the secondary
circuit supports up to (5) annunciators.
Compatible devices include:
– ANN-80 LCD Annunciator
– ANN-80C LCD Indicator (Canadian Applications)
– ANN-S/PG Serial/Parallel Printer Interface Module
– ANN-I/O LED Driver Module
– ANN-LED Annunciator Module
– ANN-RLY Relay Module (can be mounted in the FACP chassis)
•
When operating two ANN-BUS circuits, only one ANN-S/PG Printer module can be used in the system.
•
The panel is capable of operating a primary ANN-BUS (TB3) and a secondary ANN-BUS (TB1 on ANN-SEC card)
simultaneously.
2.8.1 ANN-BUS Wiring
This section contains information on calculating ANN-BUS wire distances and the types of wiring configurations (Class B). The length
of the 4-conductor wire run is governed by the power pair loading as described below.
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-80(C) LCD Annunciator/Indicator
ANN-S/PG Serial/Parallel Printer Interface Module
ANN-I/O LED Driver Module
ANN-LED Annunciator Module
ANN-RLY Relay Module
1
After calculating the total worst case current draw, Table 2.2 specifies the maximum distance the modules can be located from the FACP
on a single wire run. The table ensures 6.0 volts of line drop maximum. In general, the wire length is limited by resistance, but for
heavier wire gauges, capacitance is the limiting factor.
These cases are marked in the chart with an asterisk (*). Maximum length can never be more than 6,000 feet (1,800 m), regardless of
gauge used. The formula used to generate this chart is shown in the note below.
Total Worst Case Current
Draw (amps)
MS-5UD & MS-10UD Series Manual — P/N 52626:C7 6/12/2018
Model Number
Total worst case current draw on a single ANN-BUS cannot exceed 0.5 amp
24 VDC Power Wiring Distance: ANN-BUS Modules to FACP
22 Gauge
0.100
1,852 ft.
0.200
926 ft.
0.300
617 ft.
0.400
463 ft.
0.500
370 ft.
Table 2.1
18 Gauge
4,688 ft.
2,344 ft.
1,563 ft.
1,172 ft.
938 ft.
Table 2.2 Wiring Distances
1
Worst Case Current Draw
0.040 amps
0.040 amps
0.200 amps
0.068 amps
0.075 amps
.
16 Gauge
14 Gauge
* 6,000 ft.
* 6,000 ft.
3,731 ft.
5,906 ft.
2,488 ft.
3,937 ft.
1,866 ft.
2,953 ft.
1,493 ft.
2,362 ft.
Installation
35
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