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Overview of PROFIBUS DP
DP Base Programming Interface for CP 5613/CP 5614
30
C79000-G8976-C108-01
2.10 Typical Sequences in DP
Basic Sequence on the DP Master
A typical sequence run by a DP master when triggered by the user program is
shown below:
Step Meaning
1 Initial situation: The DP master is in the OFFLINE mode.
2 The DP master changes to the STOP mode.
3 The DP master changes to the CLEAR mode. At this point it
automatically assigns parameters to the slaves and configures
them and then starts to send cyclic zero frames or empty frames
(depending on the configuration).
4 The DP master changes to the OPERATE mode.
5 The output data of the user program are now transferred
cyclically to the slaves, the input data are transferred from the
slaves to the user program.
6
The master changes to the intermediate modes CLEAR and
STOP and then changes to the final mode OFFLINE and is
turned off.
Failure of a Slave
While the DP master is in the CLEAR or OPERATE mode, a slave may fail; in other
words, no longer respond). The master then automatically attempts to reassign
parameters and reconfigure the slave so that it can be included in the cycle again.
Activating/Deactivating Slaves
When the DP master is in the CLEAR or OPERATE mode, slaves can be activated
or deactivated. A deactivated slave is no longer accessed by the master.
AUTOCLEAR
In some circumstances, the DP master can change from the OPERATE to the
AUTOCLEAR mode, see Section 2.8.
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