Channel Structure; Grounding System - Procentec ProfiHub A5 User Manual

ProfiHub A5/B5 User Manual

1.4 Channel Structure

Every Channel is electrically isolated and internally connected to the transparent intelligent backbone.
The termination is switchable and powered by the ProfiHub. The shielding of the PROFIBUS cable can
be directly grounded or indirectly grounded (see the next paragraph).
Fig. 5 - Channel structure

1.5 Grounding System

The ProfiHubs can be grounded by 3 methods:
1) Direct grounding
2) Indirect grounding (through a capacitor)
3) Combination of direct and indirect.
In most cases it is recommended always to use Direct Grounding with the power supply and the
shielding of the PROFIBUS cables. If you do not want to ground all or some cables to the common
ground, the cable shielding should be connected to pin 'I'. A capacitor with a parallel high value
resistor will separate the 2 potentials ( ).
Fig. 5
If by accident on 1 channel the Direct Grounding is connected with the Indirect Grounding, the Direct
Grounding "wins".
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Version 2.1.1 – June 2014
Page 8 / 59
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