I wonder if is a problem with response time of PLC in some cases? If so, what is the case? How to designer it solves ? For example calculation are to complex, the next step must be calculated in 200 ms but it take 600 ms.
[Clarification:] PLCs typically execute their logic in a repeating scan sequence as follows:
- Read the inputs.
- Execute the logic.
- Write the outputs.
The result is usually a predictable scan rate.
Sometimes some complex logic has to be executed and this can extend the scan time and interfere with the performance of the process as the response time is extended.
How does the designer execute time-consuming logic without extending scan-time excessively?
Sorry for My English.