Beijer-electronics EPC TA70 AM EN Manual de usuario descargar pdf (Pagina 25)

Additional Installation Tips

7.2 EthernetConnectioninthePanel

1-1

2-2

3-3

8-8

RJ45

Industrial Ethernet

Panel PC

Shielded

Short and

unshielded

0.1 uF

250 V

5351

In some industrial units for Ethernet, the RJ45 contact’s shield is co nnected to the

chassis via a capacitor, see 1 in drawing above.

The Panel PC’s Ethernet shield is directly co

nnected to the chassis, see 2 in

drawing above.

Check wh ether the other Ethernet unit has its shield directly grounded or

grounded via a capacitor.

Note:

Inmanycases,connectingtheshieldedEthernetcablingtothechassisatbothendsis

inappropriate. Humorgroundingloopscano ccur. 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 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 uF/250 V plastic capacitor, see 5 in

drawing above. This will connect the HF transients to the ground.

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Beijer-electronics EPC TA70 AM EN Manual de usuario Pagina 25