Ethernet Connection in the Panel. Beijer Electronics EXTER T60, EXTER T60m

Additional Installation Tips

6.2 Ethernet Connection in the Panel

Industrial Ethernet

RJ45

RJ45

RJ45

1

RJ45

Shielded

4

1-1

2-2

3-3

8-8

5

3

Short and unshielded

Operator panel

RJ45 2

Operator panel

RJ45

Operator panel

RJ45

Operator panel

RJ45

0.1 uF

250 V

5351

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 µF/250 V plastic capacitor, see 5 in drawing above. This will connect the HF transients to the ground.

Beijer Electronics, MAEN809F 19