Functions
5.7 Isochronous mode
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
209
STEP 7 sets the delay time automatically to the start of the execution window by default. As
a result, the isochronous mode update of the process image partition automatically falls
within the execution window of the application cycle.
You can also set the delay time manually. A shorter delay time enables you to increase the
processing time for your user program in the isochronous mode interrupt OB. If a manual
setting is made, note that you must call the "SYNC_PI" and "SYNC_PO" instructions in the
execution window of the application cycle.
To set the delay time for your isochronous mode application, follow these steps:
1. Open the "Properties" dialog associated with the relevant isochronous mode interrupt OB.
2. In the area navigation, click the "Isochronous mode" group .
3. Clear the "Automatic setting" check box.
4. Enter your desired delay time in "Delay time (ms)".
Figure 5-73 Setting the delay time
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