01/2007
8.3 Creating a PROFIBUS configuration
8-190
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Notice
The following condition must be observed for the time of setpoint acceptance
T
O
:
DP cycle >= setpoint accept. >= isochron. master cycl. component + base
time
Tab: Clock synchronization
Setpoint acceptance [ms]:
Factor: Factor
Activating button: Adjust transfers the values displayed in the ”Clock synchron-
ization” tab to all other DP slaves S120 in the configuration.
This adjustment must be carried out at the end, and the dialog box must then be
confirmed with OK.
Tab: Clock synchronization
Button: ”Adjust”
OK
Notice
If there are different types of isochronous DP slaves in a S7 project, e.g.
different SINAMICS drives, ADI4, etc., the following parameters:
– Equidistant DP cycle T
DP
– Master application cycle T
MAPC
– Actual value acquisition T
I
– Setpoint acceptance T
O
must be set for each DP slave type separately as described above, and then
adjusted.
Adjustment only transfers the values displayed on tab card: ”Clock
Synchronization” to the DP slave 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”.
Always check that the system data blocks are error–free before storing and
compiling them. To do that select menu item: Station > Check consistency.
Dialog box:
Continuation
Adjustment
Dialog box:
End
Consistency check
8 PROFIBUS DP Communication
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