Ethernet Connection In The Operator Panel - ABB PP885 Hardware And Installation Manual

Section 7 Additional Installation Tips

Ethernet Connection in the Operator Panel

In some industrial units for Ethernet, the RJ45 contact's shield is connected to the
chassis via a capacitor, see 1 in drawing above.
The operator panel's Ethernet shield is directly connected to the chassis, see 2
in drawing above.
1.
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.
One option is to break the shield, see 3 in drawing above.
3BSE069463-600 Rev C
Shielded
0.1 μF
250 V
Check whether the other Ethernet unit has its shield directly grounded or
grounded via a capacitor.
Ethernet Connection in the Operator Panel
3
4
Short and
unshielded
1-1
2-2
3-3
8-8
5
Industrial Ethernet
RJ45
RJ45
1
RJ45
RJ45
Operator panel
RJ45
2
Operator panel
RJ45
Operator panel
RJ45
Operator panel
RJ45
33