PROFINET Installation Guideline for Cabling and Assembly

PROFINET cable assembly work
As protective ground is part of the general electrical system, it is not described in
more detail in this document. Always observe the applicable standards and
regulations!
Notice:
Some PROFINET nodes are equipped with a protective ground
connector. These are mainly PROFINET nodes with an additional,
higher-voltage power supply. Establish a protective ground connection
in compliance with the applicable regulations for these devices.
2.3.2 Functional ground
Functional ground is used to divert electromagnetic interference voltages to ground.
This improves the interference resistance of data transmission. The functional
ground is used to earth the screen of the cable and device case so diverting any
interference pickup to ground.
Manuf.
instructions
Manufacturer instructions:
The manufacturer’s documentation will generally provide important
information on how to best connect the PROFINET node to ground and
to the equipotential bonding conductor.
Some PROFINET nodes are equipped with a functional ground connector terminal.
This terminal is marked with the symbol for functional ground. Connect the
functional ground terminal of the PROFINET node to the functional ground
connector of the system using a large cross-section cable which is as short as
possible. In many cases, the entire metal construction of the system is used as
functional ground. Other devices use the installation mounting as functional ground.
You shall therefore connect the DIN rails of the system to functional ground.
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