Instruction Manual

Additional Installation Tips

20 Beijer Electronics, MAEN812C

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.

5351

1-1

2-2

3-3

8-8

Industrial Ethernet

RJ45

Operator panel

Shielded

Short and

unshielded

0.1 uF

250 V