Analysis of software or hardware causes of PLC crash

When the programmable controller PLC is running , there may be a crash, which causes unpredictable loss to industrial production. Therefore, first understand the cause of the PLC crash, and troubleshoot the cause. Software or hardware errors may cause the PLC to crash. , the following are introduced separately:


1 , hardware aspects  

    ( 1 ) I / O power, the PLC automatically detects an I / O error and enters STOP mode.  

    ( 2 ) I / O is damaged, the program runs to the feedback signal that needs this I / O , and the instruction cannot be executed downward.  

    ( 3 ) Expansion module ( function type, such as A / D) line interference or open circuit.  

    ( 4 ) There is interference or malfunction in the power supply section.  

    ( 5 ) The connection module and address assignment module of the PLC have failed.  

    ( 6 ) A fault caused by the cable.  

2 , software aspects  

    ( 1 ) Triggered an infinite loop.  

    ( 2 ) The program rewrites the contents of the system parameter area, but there is no initialization part.  

    ( 3 ) Protection program startup: hardware protection, limited use time ( recovery for payment )

    ( 4 ) Data overflow, too large step size, watchdog ( can modify DOG time ) action.

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