750 XTR Series
System Features
System manual | Version: 2.0.0
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3.2 Electrical Structure
3.2.1 Potential Groups
The I/O system is divided into the following potential groups.
•
System Level
This potential group encompasses all the system-side electronics and among other
things, includes the system supply and the local bus signals.
•
Field Level
This potential group contains the field-side power supply and I/O signals. The node
structure can be divided into different sections through the supply and segment mod-
ules. Different field potentials can be used in the individual sections.
•
Fieldbus
This potential group contains the signals of the respective fieldbus interface. The volt-
age and current levels depend on the fieldbus standard used.
•
Functional Ground
To discharge EMC interference, the system power supply, the field power supply and
the I/O signal inputs and outputs are capacitively coupled within the module to the
functional ground via the DIN-rail contacts.
Example Potential Groups / Separation with Galvanically Separated Power Supply
Infeed
1
2
4
3
Figure 12: Display of Different Potential Groups
1
System-level potential groups
2
Field-level potential groups in right node section
3
Field-level potential groups in left node section
4
Fieldbus system potential groups
