Siemens SIMATIC NET PROFIBUS Instrukcja Obsługi Strona 26

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Overview of PROFIBUS DP
DP Base Programming Interface for CP 5613/CP 5614
26
C79000-G8976-C108-01
Remedy
If the user program requires a better link to the slave than described above, there
are a number of options available:
x
With the hardware events of the CP 5613 and CP 5614, the user program can
be informed of changes on the slave.
x
With the DP protocol expansion DP-V1 master class 1 (DPC1), the user
program can read and write data with a confirmation and can confirm alarms (if
this is supported by the slaves).
x
With user-specific implementations in the user program and on the slaves, user-
specific flow controls can be achieved (packed into the DP process image or
DPC1 data) to link the master and slaves and to avoid loss of data.
x
The hardware event at the start of the CP 5613/CP 5614 cycle can be used for
synchronization.
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