Description
3.6 PROFIBUS PA
SIPART PS2 with PROFIBUS communication
34
Operating Instructions, 09/2007, A5E00127926-07
necessary basic information to find profile parameters. One parameterization tool serves all
profile-conforming devices, regardless of type or manufacturer.
Depending on the size of the installation (and therefore the number of field devices) and the
time behavior required, you implement the system with one or more PROFIBUS PA strands.
One PROFIBUS PA strand consists of the components shown in the following figure.
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Figure 3-16 PROFIBUS PA strand
FG
Field device
PC
Personal Computer
T
Terminating resistor
PCS
Process control system
Reference
PNO PROFIBUS-PA interest group
3.6.6
Connection
Control is performed by the central process control system (PCS) or by a PC for lower-
performance requirements.
In general, the following functions are combined into one coupling assembly:
●
DP/PA signal transfer
●
Bus power
●
Bus termination
Depending on the number of the PROFIBUS PA field devices to be operated in the
automation system and the time behavior required, a DP/PA coupler or a DP/PA link is used.
For standard requirements, you use a DP/PA coupler; for higher requirements, a more
powerful DP/PA link.
