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Overview of the DP Base Interface
3.2
The Importance of Configuration
Using the DP Database
The DP database contains information about the bus parameters of PROFIBUS
and about the slaves on the network. This information is evaluated when the
CP 5613/CP 5614 starts up. This means that your user program does not need to
contain these details and does not need to be modified (for example,if the data
transmission rate is changed).
Configuring Slave Data Areas
During configuration, you specify the number and type (input, output, analog,
digital) of the data areas of all the slaves. This configuration data is sent to the
slave during startup and is then checked by the slave. If the configuration data
does not match the actual properties of the slave, the slave enters this in the
diagnostic data and it is not included in cyclic operation.
Activating the Watchdog
If the watchdog of a DP slave is activated in the configuration, the DP master must
communicate with the DP slave within a selected time.
If there is no communication within this time, the slave switches its outputs to a
safe state and no longer takes part in data transfer with the master section since
the slave assumes that a serious problem has occurred, for example wire break or
failure of the DP master.
The master must then assign parameters to the slave and configure it again.
Following this, the exchange of productive data can be resumed.
The values adopted by the outputs can be found in the descriptions of the DP
slaves.
Configuring the AUTOCLEAR Property
If one of the activated slaves does not take part in the data transfer and if the
AUTOCLEAR function is set, the DP master automatically changes to the CLEAR
mode (with the coding AUTOCLEAR).
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DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-02
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