Installation guide

Planning and Designing RIO Cable System

890 USE 101 00 October 2006 21

Redundant RIO

Cable Systems

If both the head processor and the drop adapters have two cable ports, then

redundant linear cables can be run. A redundant topology provides two parallel

paths to the same remote I/O drops. It allows you to increase the communications

integrity on an RIO network, allowing the network to operate even when one cable

system is damaged or malfunctioning.

Note: Quantums use drop #1 for local I/O. When upgrading from a 984A, B, or X

PLC to a Quantum Automation Series PLC, the first drop in the RIO network will

need to be changed to a drop number other than #1.

P/S PLC RIO I/O I/O I/O

RIO Drop #2

RIO Drop #3

Last RIO Drop

P/S RIO I/O I/O I/O

Trunk Cable A Trunk Cable B

Trunk Terminator

Tap

This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com