Installation guide

Planning and Designing RIO Cable System
890 USE 101 00 October 2006 31
Illegal Coaxial Cable Topologies
Overview The following are several examples of coaxial cable design topologies that are either
not recommended or not permitted on an RIO network.
Illegal Trunk
Cable
Termination
Remote drops cannot be connected directly to the trunk cable—i.e., a remote drop
cannot be used to terminate the trunk:
All remote drops on an RIO network must be connected to a trunk cable via a tap
and a drop cable, and the last tap on a trunk cable must be terminated with a 75 Ω
Modicon 52-0422-000 Trunk Terminator.
P/S RIO I/O I/O I/O P/S RIO I/O I/O I/O P/S RIO I/O I/O I/O
PLC RIO I/O I/O I/OP/S
Trunk Cable
Tap Tap
Legal RIO Drop Legal RIO Drop Illegal RIO Drop
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com