Functional Ground - Siemens SCALANCE XP-200 Operating Instructions Manual

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4.7 Functional ground

4.7 Functional ground
EMC disturbances are diverted to ground via the functional ground. This ensures the
immunity of the data transmission.
The functional ground must be implemented with low impedance. The connection of the
functional ground must be established directly on the mounting plate or the DIN rail terminal.
The grounding screw is identified by the following symbol for the functional ground
Protective earth/functional ground
The connection of the reference potential surface with the protective circuit is normally in the
cabinet close to the power feed-in. This ground conducts fault currents to ground safely and
according to DIN/VDE 0100 is a protective ground to protect people, animals and property
from too high contact voltages.
Apart from the protective ground , there is functional grounding in the cabinet. According to
EN60204-1 (DIN/VDE 0113 T1) operational electrical circuits must be grounded. The chassis
(0 V) is grounded at one defined point. Here, once again the grounding is implemented with
the lowest leakage resistance to ground in the vicinity of the power feed-in.
With automation components, functional ground also ensures interference-free operation of
a controller. Via the functional ground, interference currents coupled in via the connecting
cables are discharged to ground.
Position
The functional ground is established via a grounding screw.
The connector for the grounding cable is on the front of the housing.
Figure 4-5
64
Position of the grounding screw on the SCALANCE XP-200
Operating Instructions, 05/2016, C79000-G8976-C428-01
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SCALANCE XP-200