ComBricks User Manual v6.4.0 | January 18| © PROCENTEC 93/219
8.2 Channel structure
Every Channel is electrically isolated and internally connected to the transparent PROFIBUS networks on the
backplane (see Fig. 51).
The shielding of the PROFIBUS cable is grounded 1-on-1 to the DIN rail.
8.3 Connecting the cable
Connect the cable to the module with a DB9 connector on the front of the module. The DB9 connector must be
suitable for use in Intrinsically safe networks, and the internal termination shall have a value of 200 Ohms.
Do not connect a cable which is connected to non-IS components. This will damage the internal
electronics and makes the use of this module dangerous in Intrinsically Safe segments.
8.4 Grounding system
Always 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 (see Fig. 51).
If by accident the Direct Grounding is connected with the Indirect Grounding, the Direct Grounding “wins”.
8.5 Baudrate detection
Refer to paragraph 7.5 for a description of the baudrate detection.
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