Siemens PLC program call - solution - Huaqiang Electronic Network

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Does the execution of a large number of FC programs in interrupt OB37 affect the processing speed of normal programs in OB1 and the speed of other interrupt programs? How does it affect the operation of the CPU?
Answer: 1. Execute a large number of FC programs in interrupt OB37. Does it affect the processing speed of normal programs in OB1 and the speed of other interrupt programs?
a. The organization block is executed according to the interrupt priority assigned by the system. The higher the number, the higher the priority, and the higher the priority, the lower the priority.
b. The default for general OB1 is level 1, OB30-OB38 defaults to level 7-15, and OB37 is level 14. The higher the number, the higher the priority.
c. OB37 executes a large number of FC programs, which takes up a long CPU time and will definitely respond to the scan (execution) of the program in OB1 or other interrupts.
2. What is the impact on the operation of the CPU?
There is no impact on the operation of the CPU itself, that is, which program the CPU runs is allocated by the system operating system. The CPU is just an implementation "institution". This question is unprofessional, so don't entangle this problem here. I hope to focus on the discussion of the question, which should be raised as follows: "Is there any impact on the real-time nature of your control system?"
3. Does it affect the real-time nature of the control system?
It is emphasized here that it is reasonable to apply the OB loop interrupt:
According to the design intention of the landlord, the control program of the landlord is scheduled by two OB cycle interruptions, namely OB37 (short cycle time, high priority) and OB1 (long cycle time, low priority).
A reasonable design is to arrange tasks (programs) with high real-time requirements and fast data update requirements in OB37. The above-mentioned relatively low-level tasks (programs) are arranged in OB1 for execution. This allows for the scheduling of tasks (programs) with priority.
An experienced program (software) designer will reasonably prioritize the interrupts of tasks (programs) in their control system. The assigned priorities are also constantly revised through practice, making their control systems more real-time.
4. It is not advisable to "execute a large number of FC programs in the interrupt OB37". If the control system has such a requirement, that is, only in this way can the real-time requirements be met, and this can be done!
The basic condition of a qualified programmer is to be able to apply interrupts skillfully and reasonably, to compile interrupt programs, and to make the structure of the control system rigorous, dexterous and scientific, and to meet the requirements of real-time control.