Beijer-electronics iX Panel TA70 EN Instrukcja Użytkownika Pobierz pdf (Strona 17)

Additional Installation Tips

6.2 EthernetConnectioninthePanel

1-1

2-2

3-3

8-8

RJ45

Industrial Ethernet

Operator panel

Shielded

Short and

unshielded

0.1 uF

250 V

5351

In some industrial units for Et hernet, 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.

Check whether the other Ethernet unit has its shield directly grounded or

grounded via a capacitor.

Note:

Inmanycases,connectingtheshieldedEthernetcablingtothechassisatbothendsis

inappropriate. Humorgroundingloopscanoccur. Unshieldedcablingmayevenresult

infewercommunicationerrors.

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 th e shi elded Ethernet cabling with a piece of

unshielded Ethernet cable, see 4 in drawing above.

You can ground the shield via an external 0.1 uF/250 V plastic capacitor, see 5 in

drawing above. Thi s will connect the HF transients to the ground.

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Beijer-electronics iX Panel TA70 EN Instrukcja Użytkownika Strona 17