Functional Earth (FE) Requirements
In order to ensure proper EMC behavior, the module must be properly connected to functional earth via the FE pad/FE mechanism described in the Anybus CompactCom 40 Hardware Design Guide. Proper EMC behavior is not guaranteed unless these FE requirements are fulfilled.
Note
The shield of the RJ45 connector is not connected directly to FE. As all nodes in a PROFINET network have to share chassis ground connection, the PROFINET cable shield has to be connected to the chassis ground at each node in the network.
For further information, see PROFINET Installation Guideline for Cabling and Assembly, available for download at www.profibus.com.