Sbus Wiring; Calculating Wiring Distance For Sbus Modules; Sbus Device Current Draw - Honeywell IFP-2100 Installation And Operation Manual

LS10143-001SK-E
4.4

SBUS Wiring

This section contains information on calculating SBUS wire distances and the types of wiring configurations
(Class A and B).
4.4.1

Calculating Wiring Distance for SBUS Modules

The IFP-2100/ECS panel has two SBUS circuits which can support up to 1.0A of module load per SBUS circuit.
When determining the type of wire and the maximum wiring distance that can be used, you will need to calculate
loads for each SBUS to ensure that each SBUS does not exceed 1.0A.
To calculate the wire gauge that must be used to connect SBUS modules to the control panel, it is necessary to
calculate the total worst case current draw for all modules on a single SBUS circuit. 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 table below.
Note: Total worst case current draw on a single SBUS cannot exceed 1 amp. If a large number of accessory mod-
ules are required, and the worst case current draw will exceed the 2 amps total, then the current draw must
be distributed using RPS-1000 Power Expanders. Each RPS-1000 Power Expander provides an additional
SBUS, with an additional 1 amp of SBUS current. Wiring distance calculations are done separately for
each RPS-1000, and separately for each control panel SBUS.
RA-2000, RA-1000, RA-100 Fire Annunciator
6815 SLC Loop Expander
5815XL SLC Loop Expander
5824 Serial/Parallel Printer Interface Module
5880 LED I/O Module
5865 LED Annunciator
RPS-1000 Intelligent Power Supply
5496 NAC Expander
ECS-50W
ECS-125W
ECS-VCM / ECS-VCM with ECS-SW24*
ECS-NVCM Network Voice Control Module
ECS-EMG NVCM keypad
ECS-LOC
ECS-DUAL50W
ECS-DUAL50W WITH ECS-50WBU
SK-NIC Network Interface Card
CELL-MOD/CELL-CAB-SK
SK-F485C Fiber Converter
Note: Refer to Table 3-2 if using IDP SLC devices, Table 3-3 for SK devices, and refer to Table 3-4 if using SD
SLC devices for maximum number of each type of device that can be used per system.
* All devices must use the same SBUS and VBUS.
After calculating the total worst case current draw, refer toTable 4-2 for the maximum distance the modules can
be located from the panel 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.
Table 4-1: SBUS Device Current Draw
Model Number
4-6
Control Panel Installation
Worst Case Current Draw
.120 amps
.078 amps
.150 amps
.040 amps
.250 amps
.200 amps
.010 amps
.010 amps
.010 amps
.010 amps
.115 amps /.185 amps
.059 amps
.06 amps
.210 amps /.325 amps
.010 amps
.010 amps
.021 amps
.145 amps
.125 amps