8/30/2021 11:49 AM | |
Joined: 3/14/2008 Last visit: 9/20/2024 Posts: 2095 Rating: (936)
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Hi, OB30-38 are interrupt OB's. They are called each 100ms, 500ms, 1sec, 2sec, etc. depending which OB you use. This will make sure all blocks in an OB are executed at a fixed time always, unlike OB1. OB1 time can increase if the CPU is very busy. for example large code will result that OB1 takes longer to process and thus the code could take longer to process. Together with the process image of the CPU, hardware signals can also be read in and written in a fixed interrupt cycle. This will make sure the signals processed correctly each time.
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