Table of contents
S7-300, CPU 31xC and CPU 31x: Installation
x
Operating Instructions, Edition 08/2004, A5E00105492-05
A Appendix.................................................................................................................................................A-1
A.1
General Rules and Regulations for S7-300 Operation ..............................................................A-1
A.2
Protection against electromagnetic interference........................................................................A-3
A.2.1
Basic Points for EMC-compliant system installations ................................................................A-3
A.2.2
Five basic rules for securing EMC .............................................................................................A-5
A.2.2.1 1. Basic rule for ensuring EMC ..................................................................................................A-5
A.2.2.2 2. Basic rule for ensuring EMC ..................................................................................................A-5
A.2.2.3 3. Basic rule for ensuring EMC ..................................................................................................A-6
A.2.2.4 4. Basic rule for ensuring EMC ..................................................................................................A-6
A.2.2.5 5. Basic rule for ensuring EMC ..................................................................................................A-7
A.2.3 EMC-compliant
installation of PLCs...........................................................................................A-7
A.2.4
Examples of an EMC-compliant installation: Cabinet installation..............................................A-9
A.2.5
Examples of an EMC-compliant installation: Wall mounting....................................................A-10
A.2.6 Cable
shielding.........................................................................................................................A-12
A.2.7 Equipotential bonding...............................................................................................................A-14
A.2.8 Cable
routing inside buildings ..................................................................................................A-16
A.2.9 Outdoor
routing of cables.........................................................................................................A-18
A.3
Lightning and Surge Voltage Protection ..................................................................................A-18
A.3.1 Overview ..................................................................................................................................A-18
A.3.2 Lightning
protection zone concept ...........................................................................................A-19
A.3.3
Rules for the transition point between lightning protection zones 0 <-> 1 ...............................A-21
A.3.4
Rules for the transition point between lightning protection zones 1 <-> 2 and higher.............A-22
A.3.5
Example: Surge protection circuit for networked S7-300 PLCs...............................................A-26
A.3.6
How to Protect Digital Output Modules against Inductive Surge Voltage................................A-28
A.4
Safety of Electronic Control Equipment ...................................................................................A-30
Glossary ..................................................................................................................................... Glossary-1
Index................................................................................................................................................ Index-1