Tyco 4100U SPS IDNet Wiring, Continued on next page, Overview IDNet Wiring Guidelines

SPS IDNet Wiring

Overview

IDNet Wiring

Guidelines

This section describes how the IDNet on the SPS connects to addressable devices/detectors.

The guidelines governing IDNet wiring guidelines are covered in chpt 8, IDNet Installation.

Up to 250 IDNet initiating devices are supported on the SPS IDNet channel. The SPS supports both Class A (loop) and Class B(string) wiring. Class A wiring is mandatory for connection to more than 40 devices.

Class A wiring allows IDNet appliances to communicate with the SPS even in the event of an open circuit somewhere in the loop. Class A wiring requires that two wires are routed from the SPS to each IDNet appliance, and then back again to the SPS.

Class B wiring allows “T” tapping, and therefore requires less wiring distance per installation than Class A. Note that Class B wiring does not require end-of-line resistors, because each IDNet appliance communicates directly to the SPS.

Ferrite beads are required on the SPS IDNet cables (ref Fig 7.1). Refer to chpt 8 IDNet Installation for the guidelines governing IDNet wiring.

Continued on next page

7-12