1: Grounding; Wiring The Communication Ring; 1: Copper Cable Segments - Honeywell H-S81-HS Manual

Wiring the Communication Ring

4.1.1 Grounding
To guarantee correct system operation, it is important to make sure that the metal backboxes con-
taining the modules are properly grounded.
4.2 Wiring the Communication Ring
All the Safety Bus system modules are wired to form a ring that starts and ends in the control
panel. The ring consists of individual cable segments that connect the modules and the panel to
each other. Each individual segment can be wired using a screened wire or a fiber optic.
4.2.1 Copper Cable Segments
To guarantee correct operation, each individual cable segment must not exceed 20 ft (6.096 m) in
length and must be wired using only screened CAN BUS communication cables with typical 120Ω
impedance. The table below lists the typical cable values to use for the communication ring.
Power cabled between the power supplies, SBUS modules, and communication links between the
SBUS modules and the FACP must not exceed 20 feet (6.096 meters), be in the same room, in con-
duit.
To ensure proper functioning of the system of the system, all wiring shall be made with shielded
cable intended for CanBus communication, having 120Ω typical impedance.
The following tables show other characteristics of the cable.
Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019
Figure 4.2 Ground Connections Inside the Box
Installation
52