User Documentation

2053260000/05/201526
Planning
2.9 Earthing and equipotential bonding
A good earthing system and good equipotential bonding system are very
important for the electrical interference immunity of PROFINET networks. Earth
the PROFINET cable shields on both sides, i.e. on each of the connected devices,
in order to reduce the effects of electromagnetic interference. The equipotential
bonding ensures that the earth potential is equal throughout the entire
PROFINET network. This protects against equipotential bonding currents that
could otherwise ow over the shielding of the PROFINET cable. The following
explanations provide basic information on installing the earthing and the
equipotential bonding.
Manufacturer's instructions
Please read the information provided by the manufacturer.
This information provides you with important details on how to
best connect the PROFINET stations with the earthing and the
equipotential bonding.
2.9.1 Protective earth
The protective earth is essentially used to protect people against an electric
shock in the event of a fault. However, the protective earth also protects
machines and installations against damage from faults. Metallic conductive
parts, such as frames, control cabinets or plant parts must be connected to the
protective earth. The conductor used must be measured so that it can discharge
residual current in the event of a fault.
The protective earth is designated by the following symbol:
h