750 XTR Series
Planning
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System manual | Version: 2.0.0
Figure 19: Shield Clamping Saddle on Carrier (Examples)
Figure 20: Shield Clamping Saddle on U-Shaped Busbar (Example)
To keep potential differences from other potential groups low, the cable shield must be
connected to functional ground. The impedance of this connection should be kept as low
as possible, for example by creating a large contact area.
Figure 21: Cable Shield to Ground Potential
If the I/O system is located in a metallic housing, and electromagnetic influences inside
the housing are fairly low, the connection of cable shield and functional ground should be
made as close as possible to the housing entry. This diverts interspersed interference at
a greater distance from the I/O system.
Insulation Testing
Both the system voltage and field voltage side are capacitively coupled to the DIN-rail. If
an I/O module is mounted on the DIN-rail, application of an AC voltage between the DIN-
rail and at least one of these two potentials can destroy the module.
Use only direct current (DC) for insulation testing. Discharge the module completely be-
fore applying the test voltage again.
5.2.8 Data Security
Professional planning and design is an important requirement for securing data confiden-
tiality, availability and integrity.
Random Influences
Data transmission and processing can be disrupted by random influences, such as tem-
porary electromagnetic disturbances. Proper setup can significantly reduce the likelihood
of corruption or destruction of data.
For additional information see:
8
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