Software or hardware of PLC crashes cause analysis

Programmable controller PLC runtime may appear crash, this causes an estimate to the industrial production losses, therefore, must first understand the cause of the crash of PLC, for reasons of illness, PLC controller software or hardware errors are likely to lead to crash, separately introduces below: 1, the hardware ( 1) The I/O electric, PLC controller I/O error detected automatically, into the STOP mode. ( 2) I/O is damaged, the program runs to the I/O feedback signal, can't down executes instructions. ( 3) Extension module ( Functional, such as A/D) Circuit interference or open circuit, etc. ( 4) There is interference power part or malfunction. ( 5) Connection module of PLC and address allocation module is out of order. ( 6) Cable fault. 2, software ( 1) Triggered the infinite loop. ( 2) The contents of the program rewriting the system parameter area, there is no initialization section. ( 3) Start protection: hardware protection, and restrict the use of time, For 2 days) ( 4) Data overflow, step size is too large, the watchdog ( Time can modify the DOG) The action.
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