Cable Routing; Guidelines; Cable Routing Methods - Siemens SIMATIC TI555 System Manual

4.2

Cable Routing

Guidelines

Cable Routing

Methods
Cabling and Wiring the System
4-4
Follow these suggestions when planning your cable routing.
Allow for system growth. Provide for attachment of future I/O bases by
routing cable through all possible areas of plant expansion.
The TI545/TI555 can have a trunk line (attached to its I/O) that
extends up to 3300 feet (1000 m) using RS-485 (twisted pair) cables.
Take steps to bypass or eliminate noise sources to reduce system data
error rates. The following are common sources of electrical noise.
V
Power distribution mains
V
Arcing motors
V
Fluorescent lighting
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Undesired signal transfer between adjacent circuits
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Poor terminations of cable connector
Do not allow the trunk cable to come into contact with any other
electrical conductor.
If cabling is installed inside a conduit, the conduit should be grounded
according to applicable electrical codes.
Maintain a minimum of 3 feet (0.91 m) between trunk lines and the
following noise sources.
V
Power lines
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Electric motors and motor starters
V
Generators
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Electric welders
The type of routing is usually determined by the type of building in which
the cables are being installed. Any combination of the following may be used
to route the cables: under-floor, in-ceiling, or surface duct.
NOTE: Electrical and fire safety must be considered in planning the
installation. Modern codes seek to limit the hazard of cable installations as
a means of propagating fire and smoke. In order to ensure a proper level of
safety compliance, observe local installation code practices and guidelines.
TI545/TI555 System Manual