Siemens SCALANCE XB-200 사용자 설명서
Connecting up
4.4 Functional ground
SCALANCE XB-200
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Operating Instructions, 02/2015, C79000-G8976-C359-01
Note
Pin assignment of the RJ-12 jack on the device
The RJ-12 jack on the device has a pinout to match the RJ-11 plug of the connecting cable
Pin assignment of the RJ-12 jack on the device
The RJ-12 jack on the device has a pinout to match the RJ-11 plug of the connecting cable
mentioned above.
4.4
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
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 SCALANCE XB-200 has a terminal for functional ground, refer to the section "Power
The SCALANCE XB-200 has a terminal for functional ground, refer to the section "Power
The terminal is identified by the following symbol for the functional ground
.
Follow the steps below to connect the functional ground:
1. Connect the terminal of the SCALANCE XB-200 with as short a cable as possible ≤ 150
1. Connect the terminal of the SCALANCE XB-200 with as short a cable as possible ≤ 150
mm and with the required cross-sectional area to a grounded part of the system (DIN
rail).
2. Connect the DIN rail with the ground of the system.
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
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
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
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.