Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 19)

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PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
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Figure 2.6 – Cable Topologies
PROFIBUS
Interface
Network
Distributed Control
System (Host)
Repeater
Tree
Daisy Chain
Bus with spurs
(or drops)
Point-to-point
Schematic topology: Details such
as terminators and power supplies
not shown
Daisy Chain
2.2.4.1 Cable Shielding and Grounding for PROFIBUS DP
For best performance, PROFIBUS DP cables should be shielded. Per PROFIBUS Technical Guidelines,
the cable shield should be connected at the beginning and end of the segment. Alternatively, a 10-12
AWG ground wire may be run to each MX/QX.
In Figure 2.7, the grounding point is shown at the junction of the field devices and at each field device.
Figure 2.7 – Use of Shielded Cable in PROFIBUS DP
PROFIBUS
Interface
Field
Device
T
Field
Device
T
Field
Device