Beijer Electronics EXTER K100 EN - Manual (Page 22)

Additional Installation Tips
22 Beijer Electronics, MAEN773D
6.2 Ethernet Connection in the Panel
1. In some industrial units for Ethernet, the RJ45 contact’s shield is connected to
the chassis via a capacitor.
2. The operator panel’s Ethernet shield is directly connected to the chassis.
Check whether the other Ethernet unit has its shield directly grounded or grounded
via a capacitor.
In many cases, connecting the shielded Ethernet cabling to the chassis at both ends
is inappropriate. Hum or grounding loops can occur. Unshielded cabling may even
result in fewer communication errors.
A good solution may be to use a shielded Ethernet cable , but to connect the shield at
one end only.
3. One option is to break the shield.
4. A more elegant method is to expand the shielded Ethernet cabling with a piece
of unshielded Ethernet cable.
5. You can ground the shield via an external 0.1 uF/250 V plastic capacitor. This
will connect the HF transients to the ground.
1
2
3
4
5
5351
1-1
2-2
3-3
8-8
Industrial Ethernet
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
Operator panel
Operator panel
Operator panel
Operator panel
Shielded
Short and
unshielded
0.1 uF
250 V