Software protection method for preventing digital feedback control system from being out of control
A feedback control system and software protection technology, which is applied to the program control and electrical program control in the sequence/logic controller, can solve the problem that the digital feedback control system cannot be effectively prevented from being out of control, and achieve high reliability and software code The effect of small amount and simple protection method
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[0010] The present invention firstly judges whether the digital feedback signal can be received normally within the cycle of the control software; secondly judges the correctness of the received signal, if the feedback signal is abnormal, the system output control signal closes the system output in real time to ensure system security.
[0011] The compiling of anti-runaway software subroutine among the present invention can be according to figure 1 The flowchart of the software implementation is shown.
[0012] The specific implementation process is as follows:
[0013] 1. According to the length of the cycle period of the system control software and the real-time requirements of the system protection, the number of times that the valid digital feedback signal is not received continuously, the deviation threshold value of the adjacent two digital feedback signals, and the allowed two adjacent digital feedback signals in the closed-loop state The number of times that the devi...
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