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2.5
Startup and Operational Phase of a DP System
Functions of the DP Master during Startup and Operation
The DP master handles the following tasks:
Initialization of the DP system
Parameter assignment/configuration of the DP slaves
Cyclic data transfer to the DP slaves
Monitoring the DP slaves
Storage of diagnostic information
Initialization
The DP master can only exchange productive data with the DP slaves when it has
assigned parameters to the slaves and configured them. The parameter
assignment/configuration takes place as follows:
During the startup phase of the DP master
Following any temporary failure of a DP slave during the productive phase
Parameter Assignment
The parameter assignment frame provides global operating parameters for the DP
slave (for example B.ID).
Configuration
The configuration frame is sent after the DP slave has been assigned parameters.
This frame contains the current configuration of the DP slave. The configuration
includes the number and type of input/output ports. The DP slave compares the
received configuration frame with the values that it determined itself during the
startup phase. If the values match, the DP slave confirms the configuration and
changes to the productive phase.
State of the Slave
During the operational phase, the DP master evaluates the confirmation frames
received from the DP slaves. Based on this information, the DP master can find out
the current state of the DP slaves.
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-02
Overview of PROFIBUS DP
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