S7 IEC Functions

Hello All,

I am working on updating a Siemens program to count missing production pieces. (processor is a S7 416DP2)
We have 3 shifts and I will need to reset the counter at every shift change. I have added the IEC Functions to the program, but I am not sure exactly how I can get the time and conduct a comparison to activate the reset output to the counter display. I am also a little confused about the data types and the representation of the time. For example how would I compare it to a static value of 15:00?

Please help me resolve this task.

Thank you.

Have a look at this example implementation. I generate three booleans which come on for one scan at each shift change. For testing I connected the one shots to counters.

Thank you very much for the assistance!

Here's the STL comparison and one shot generation logic done using LAD:

Thanks it works great. Now a different question.
Is there a way to sync the cpu time with Wincc pc time automatically. This will help to keep the correct time in the cpu with day light saving time.
Thanks

For Review

Usage of the IEC functions in my app for review.

Thanks!