7
CMVPFB01A
Installation
3.3.3 Connections and Shielding
To ensure good system noise immunity all networks cables should be correctly grounded:
Minimum grounding recommendation: ground the network cable once in every cubical.
Ideal grounding recommendation: ground the network cable on or as near to each drive as possible.
For wiring of cable to the connector plug the unscreened cable cores should be kept as short as
possible; recommended maximum of 20mm. The shield connection of terminal 1 should also be wired
to earth (PE).
20mm
max
Connect to
drive earth
(PE)
1
2
3
4
5
Figure 6: Connector Wiring Diagram
3.3.4 Network Termination
In high speed fieldbus networks such as PROFIBUS-DP it is essential to install the specified termination
resistors, i.e. one at both ends of a network segment. Failure to do so will result in signals being reflected
back along the cable which will cause data corruption.
The SMV PROFIBUS-DP module is equipped with integrated termination resistors, and can be switched into
the network by setting SW1 to the ON position as shown in Figure 7.
OFF
ON
Termination
Switch location
Figure 7: Module Network Termination Switch
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