Functional Ground - Siemens SIMATIC NET SCALANCE XCH-100 Equipment Manual

• If you connect a communications node to an unmonitored port or disconnect it, this does not
• The signaling contact remains open until one of the following events occurs:
5.6

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 IE switch has a grounding screw (fillister head screw with clamping washer und disk) for
functional ground, refer to the section "Device views (Page 13)".
The grounding screw is identified by the following symbol for the functional ground
Follow the steps below to connect the functional ground:
①
②
1. Loosen the grounding screw).
2. Put the grounding terminal and grounding screw together.
3. Tighten the grounding screw with a maximum torque of 0.75 Nm.
Protective/functional ground
The connection of the reference potential surface with the protective ground system is normally
in the cabinet close to the power feed-in. This ground conducts fault currents to ground safely
and according 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) electrical circuits must be grounded. The chassis (0 V) is
SCALANCE XCH-100/XCM-100
Equipment Manual, 11/2022, C79000-G8976-C662-01
cause an error message.
– The problem is eliminated.
– The current status is entered in the fault mask as the new desired status.
Grounding terminal with cable
Fillister head screw with spring washer and washer
1
2
Connecting up
5.6 Functional ground
.
43