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Cabling and Wiring the System

6-2

SIMATIC 545/555/575 System Manual

6.1 Cable Routing

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.

• Take steps to bypass or eliminate noise sources in order to reduce

system data error rates. The following are common sources of electrical

noise.

V Power distribution mains

V Arcing motors and motor starters

V Fluorescent lighting

V Undesired signal transfer between adjacent circuits

V 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 (1 m) between trunk lines and the

following noise sources.

V Power lines

V Electric motors and motor starters

V Generators

V 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.

WARNING

Electrical and fire safety must be considered in planning the installation.

To ensure safety compliance, observe local installation code guidelines.

Guidelines

Cable Routing

Methods

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