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2 ethernet connection in the panel, Additional installation tips – Beijer Electronics EXTER K20m EN User Manual

Page 22

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Additional Installation Tips

22

Beijer Electronics, MAEN852A

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