Apart from the protective earth, there is functional ground in the cabinet. According to
EN60204-1 (DIN/VDE 0113 T1) electrical circuits must be grounded. The chassis (0 V) is
grounded at one dened 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
and EMC interferences are discharged to ground.
Functional grounding with SCALANCE XB-000
Grounding is not mandatory for operation of the SCALANCE XB-000 but it increases the
resistance of the data transmission against interference. The functional ground must be
implemented with low impedance.
Follow these steps to connect the functional ground:
1. Connect pin 1 of the terminal block of the power supply with a short cable (≤ 150 mm) to the
DIN rail.
2. Connect the DIN rail to the functional grounding in the control cabinet.
6.5 Twisted pair cable
Recommendation
• Cable quality at least CAT 5
• Standard cables and IE FC RJ-45 Plug 180 connectors that can be assembled in the eld for
connection to the LAN over greater distances.
• To connect the device over a short distance, preassembled cables e.g. TP Cord RJ-45 0.5m
6.6 IE FC RJ-45 Plug 180
The rugged node connectors are designed for industry with PROFINET-compliant connectors
and provide additional strain and bending relief with a locking mechanism on the casing.
Connecting up
6.6 IE FC RJ-45 Plug 180
SCALANCE XB-000
52 Operating Instructions, 01/2022, A2B00077300-11
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