PROFIBUS DP Communication
8.3 Creating a PROFIBUS configuration
Manual
248
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
NOTICE
If an S7 project includes different equidistant DP slave types, such as different SINAMICS
drives, ADI4, etc., the following parameter settings must be made separately for each DP
slave type as described above, and an alignment must be performed:
•
Equidistant DP cycle TDP
•
Master application cycle TMAPC
•
Actual value acquisition TI
•
Setpoint acceptance TO
The alignment only transfers the values displayed in the "Isochronous mode" tab to the DP
slaves of the same type.
8.3.4
Generating system data blocks (SDB)
System data blocks (SDB) contain all the information required for PROFIBUS
communication between the DP master and connected DP slaves. System data blocks are
generated by compiling the current configuration with "HW Config".
Consistency check
Always check that the system data blocks are error-free before storing and compiling them.
To do that select menu command Station > check consistency in the HW config.
If inconsistencies are detected in the configuration, an error dialog box is displayed and the
error messages and help are displayed.
Save and compile
Use the menu command Station > Save and compile to save the current configuration in the
S7 project as the "station" object and compile it eventually.
System data blocks
If the configuration is compiled without error the system data blocks are generated and
stored in the "Modules" directory of the PLC.
In the "SIN840Di sl" example project, the system data blocks are located at:
SIN840Di sl > SIMATIC 300(1) > PLC317-2DP 2AJ10 > STEP 7-Program(3) > Modules >
System data
The current system data blocks can be displayed by double-clicking the "System data" icon
in the "System data modules" dialog box.
Note
System data blocks cannot be edited individually. Only the configuration as a whole can be
edited.
