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6.2
Ethernet Connection in the Panel
Shielded
0.1 uF
250 V
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. Check whether the other Ethernet unit has its shield directly grounded or
grounded via a capacitor.
Note:
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.
A more elegant method is to expand the shielded Ethernet cabling with a piece of
unshielded Ethernet cable, see 4 in drawing above.
You can ground the shield via an external 0.1 μ F/250 V plastic capacitor, see 5 in
drawing above. This will connect the HF transients to the ground.
Mitsubishi Electric, MA00776E
Industrial Ethernet
RJ45
RJ45
RJ45
RJ45
Operator panel
RJ45
Operator panel
3
RJ45
4
Short and
Operator panel
unshielded
1-1
2-2
3-3
RJ45
8-8
Operator panel
5
RJ45
Additional Installation Tips
1
2
5351
20
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