Siemens SIMATIC ET 200AL - Section 8

Designing interference-free controllers
Function Manual, 06/2014, A5E03461486-AB
5
Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide .............................................................................................................................. 6
2 Basic information on electromagnetic compatibility .................................................................................. 7
2.1 Overview of possible interference .................................................................................................. 7
2.2 Coupling mechanisms .................................................................................................................... 8
3 Interference-free cable routing ................................................................................................................ 9
3.1 Classifying cables into cable categories ........................................................................................ 9
3.2 Cable routing inside cabinets in buildings .................................................................................... 11
3.3 Cable routing outside cabinets and inside buildings .................................................................... 11
3.4 Cable routing outside buildings .................................................................................................... 12
3.5 Underground cable routing .......................................................................................................... 13
3.6 Bending radii and tensile strength of cables ................................................................................ 14
4 Cable shielding ..................................................................................................................................... 15
4.1 Connecting the cable shielding for S7-1500 and ET 200MP ....................................................... 17
4.2 Connecting the cable shielding for ET 200SP ............................................................................. 19
4.3 Connecting the cable shielding for ET 200AL .............................................................................. 20
4.4 Connecting the cable shield for bus cables ................................................................................. 21
4.5 Connecting the cable shield for other components...................................................................... 22
5 Equipotential bonding ............................................................................................................................ 23
6 Special measures for interference-free operation .................................................................................. 25
7 Lightning protection and overvoltage protection ..................................................................................... 26
7.1 What is lightning and overvoltage protection? ............................................................................. 26
7.2 Lightning protection zone concept ............................................................................................... 27
7.3 Rules and components for the transitions between lightning protection zones ........................... 29
Index..................................................................................................................................................... 37