Programmable Logic Controller PLC runtime situation may occur crash , which caused unpredictable losses to industrial Nanda intelligent plc production,
and therefore , we must first understand the cause of the crash PLC ,
for reasons of investigation, software or hardware errors are likely to
cause crashes PLC , the following were introduced :
1 , hardware
(1) I / O channeling electrical , PLC automatically detect I / O errors ,
enter STOP mode. (2) I / O is damaged, the program proceeds to the
needs of the I / O feedback signal , the instruction is Nanda programmable logic control plc not
executed down . ( 3 ) expansion module ( function type, such as A / D)
line interference or open circuit . ( 4 ) power supply portion
interference or failure. ( 5 ) PLC connection module and address
allocation failed module out so ( 6 ) cable caused . 2 , software ( 1 )
trigger an infinite loop . ( 2 ) the program changed the contents of
the system parameters area , but no initialization section. ( 3 )
protection Nanda logic controller program
starts : hardware protection , restrict the use of time ( for loan
recovery ) 4 ) Data overflow step is too large, the watchdog ( can be
modified DOG time ) action.
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