Setting The Application Cycle And Delay Time - Siemens SIMATIC S7-1500 Function Manual

5.6

Setting the application cycle and delay time

Requirements
● You have created an isochronous mode configuration in STEP 7.
● You have created an isochronous mode interrupt OB Synchronous Cycle (OB 6x).
● The isochronous mode interrupt OB is open.
Setting the application cycle
The application cycle is a multiple of data cycle T_DC (send clock). You use the application
cycle setting to reduce the CPU utilization caused by execution of the isochronous mode
interrupt OB. In the following example, the OB is called only after every 2nd data cycle T_DC
in the CPU.
To set the application cycle for your isochronous mode application, follow these steps:
1. Open the "Properties" dialog of the isochronous mode interrupt OB under consideration.
2. In the area navigation, click the "Isochronous mode" group .
3. Set the application cycle in "Application cycle (ms)". Open the drop-down list box and
select the application cycle. The drop-down list offers multiples of data cycle T_DC as
possible values for the application cycle. Data cycle T_DC is set to 2 ms in the following
figure.
Figure 5-13
Isochronous mode
Function Manual, 10/2018, A5E43884988-AA
Setting the application cycle
Configuring isochronous mode
5.6 Setting the application cycle and delay time
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