Additional Installation Tip s
Note:
Thegroundingwiresshouldbeshortandtheconductorshouldhavealargearea.
Along,thingroundingwirehasaveryhighimpedance(resistance)athighfrequencies
anddoesnotguidedisturbancestotheground.
Multi-wireconductorsarebetterthansinglewireconductorswiththesamearea.
Abraidedconductorwirewiththesameareaisevenbetter. Thebestisashort,thick
groundingbraid.
6.2 EthernetConnectioninthe
OperatorPanel
1
2
3
4
5
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
RJ45
Industrial Ethernet
Operator panel
Operator panel
Operator panel
Operator panel
Shielded
Short and
unshielded
0.1 μF
250 V
1-1
3-3
8-8
2-2
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:
Inmanycases,connectingtheshieldedEthernetcablingtothechassisatbothendsis
inappropriate. Humorgroundingloopscanoccur. Unshieldedcablingmayevenresult
infewercommunicationerrors.
BeijerElectronics, MAEN181B
19
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