Cable Laying Guidelines; Laying Of Copper Cable - Control Technology 2500 Series Installation And Operation Manual

Profibus remote base controller

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Cable laying guidelines

Data transfer in PROFIBUS systems is based on an interference-immune symmetrical bus system to

the RS 485 specification using shielded twisted pair cable. With correct system installation, small

external sources of interference are led to ground through the cable shield without causing interference in the

data lines. Interference of this type can largely be avoided with appropriate EMC measures such as EMC-

compliant system installation, EMC-compliant cable laying and measures that avoid large ground

potential differences.

Electromagnetic interference from sources such as switching processes, rectifiers and circuit breakers

can cause equipment faults to occur. In addition, overvoltage and lightning strikes can destroy

electronic components in fieldbus devices. Correct operation of the plant can then no longer be

guaranteed.

Particularly for equipment containing frequency inverters (variable speed drives), the manufacturer's

regulations for EMC compliance must be observed for the following components:

Filters,

Chokes, and

CTI 2500-RBC Installation and Operation Guide V1.6

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