Installation guide

Planning and Designing RIO Cable System

890 USE 101 00 October 2006

Open Taps If a tap is inserted on the trunk for future use and does not currently have a drop

cable connected to it, it must be terminated with a Modicon 52-0402-000 Tap Port

Terminator.

Illegal Trunk

Cable

Connections

Star topologies, which use multiple splitters and multiple terminators on trunk and

drop cables, and ring topologies, which form a loop of trunk cable with no terminator,

are not permitted in cable systems consisting of coaxial cable only:

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

RIO I/O I/O I/OPLCP/S

Head (with RIO Drop #1)

Trunk Cable

Last RIO Drop

Tap

Drop Cable

Tap

Trunk Terminator

RIO Drop #2

This open tap must

be terminated

RIO I/O I/O I/OPLCP/S RIO I/O I/O I/OPLCP/S

Star Topology Ring Topology

SplitterSplitter

Splitter

Tap

Tap Tap

Note: These kinds of topologies are also not permissible when fiber optic cable is

used. See Using Fiber Optics in an RIO System, p. 34.

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