Designing interference-free controllers
Function Manual, 06/2014, A5E03461486-AB
9
Interference-free cable routing
3
This chapter describes the EMC-compatible classification of cables and cable routing for
bus, data, signal and supply lines.
3.1
Classifying cables into cable categories
Classify the cables into cable categories according to their sensitivity to interference coupling
and interference emission. The further away from one another cables of different cable
categories are installed, the lower the mutual influence by capacitive and inductive coupling.
The following table shows the cable categories into which you can classify your cables
accordingly.
Table 3- 1
Cable categories
Category A
•
Signal lines to I/O modules
•
Bus and data lines (for example, PROFIBUS, PROFINET)
•
Lines to HMI devices
•
Supply lines for extra-low voltages (< 24V DC or < 60V AC)
Category B
•
Supply lines with safe electrical isolation (SELV)
•
Supply voltages < 400 V
Category C
•
Supply voltages > 400 V
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