Siemens Simatic PCS 7 Commissioning Manual page 41

Field device as Link Master
If field devices are to be used as Link Master , the following settings are necessary:
● Slot Time > 13
● Bus address of the field device (Link Master) > 32
"Calculate schedule" cancelled
If the schedule calculation could not be executed successfully, you receive an error message.
Check the settings of the bus parameters.
Note
Error message "Cancel Schedule Calculation: Error at bus parameter"
The error message "Cancel Schedule Calculation: Error at bus parameter" is issued by
SIMATIC PDM if there are too many configured interconnections.
You can find additional information on this in the section "Additional notes on configuration
(Page 27)".
Checking the bus parameters
1. In the "Properties - Foundation Fieldbus" dialog box, select the "Bus parameters" tab.
2. In the "Bus parameters" area, select the "Automatic calculation" radio button.
3. Switch to the "Macrocycle" tab.
4. Click the "Calculate schedule" button.
Requirements for downloading
Note
Observe the following if you have added new FF devices to the FF segment or if you want to
use new parameters.
● Online changes are not possible in these cases.
● First, you have to configure all the interconnections.
● If required, correct the macrocycle settings.
FOUNDATION Fieldbus
Commissioning Manual, 03/2013, A5E03880935-02
The default values are set.
If your bus parameters deviate from the default values, you can adapt the values in the
input boxes ("acyclical percentage" and "macrocycle").
Run the schedule calculation every time you make a change.
Engineering
4.3 Parameter assignment
41