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7.4. Data exchange between PROFIBUS-DP devices
Initializing, restart and user data communication
Prior to any user data exchange between master and slave every slave is re-initialized. The master transmits
parameterization and configuration data to the slave. Only if the parameterization and configuration data
coincide with the data stored in the slave the user data exchange will be proceeded as follows:
Diagnostic request by master
The master transmits a Slave Diagnose Request (Slave_Diag), the slave responds by a Slave Diagnose
Response.
This way, the master verifies whether the slave exists in the bus and is ready for parameterization and
configuration.
Slave parameterization
The master transmits a Slave Parameter Request (Set_Prm).
By the parameterization data the slave is informed about actual bus parameters, monitoring times and slave-
specific parameters. During the projecting process the parameters are directly or indirectly adopted by the
GSD file. The slave compares these parameterization data with its own stored data.
Slave configuration
The master transmits a Check Configuration Request (Chk_Cfg).
The master informs the slave about volume (number of data bytes) and structure (data consistency) of the
input and output ranges to be exchanged. The slave compares this configuration with its own configuration.
Diagnosis request prior to data exchange
The master transmits another Slave Diagnose Request (Slave_Diag), the slave responds by a Slave
Diagnose Response.
The master now verifies if parameterization and configuration coincide with the data stored in the slave. If the
data requested by master is admissible and correct the slave signalizes its readiness for user data transfer
via the diagnostic data.
Data_Exchange
The slave now will react exclusively to the master it was parameterized and configured by.
The master transmits a user data request (Data_Exchange), the slave responds by a user data response
informing the master about any current diagnostic events. The slave provides the true diagnosis and status
information only after the master's diagnosis telegram.
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Baumer IVO GmbH & Co. KG
22.11.12
Villingen-Schwenningen, Germany