Manual BG41/BG42/BG43 Startup
Rev. 99/49 5-31
5.7 Structure guidelines
The structure guidelines contain information on the interference immune structure of stored-
program controls. It is described how interferences in automation equipment can occur, how
electromagnetic compatibility (EMC) can be saved and how to act by a screening.
5.7.1 What does EMC mean?
One understands by electromagnetic compatibility (EMC) the capability of an electric piece of
equipment to function without an error in a pre-given electromagnetic environment, without being
influenced by its environment or itself influence its environment in an undue manner.
All products are developed for operation in tough industrial environments and fulfil high standards
with regard to EMC. However, you should carry out an EMC planning before installing the control
and include possible sources of interference in the examination.
5.7.2 Overview of the possible effects of interferences
Elektromagnetic interferences can launch into the automation equipment in different ways.
•= Fields
•= E/A signal lines
•= Bus system
•= Current supply
•= Ground wire
Depending on the expansion medium (conducted or not) and the distance from the source of
interference, interferences succeed in entering the automation equipment in different coupling
mechanisms.
They are differentiated as follows:
•= galvanic coupling
•= capacitive coupling
•= inductive coupling
•= radiation coupling
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