Reasons for the programmable controller PLC crashing during operation-EEWORLD

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Programmable controller PLC may crash during operation, which will cause unpredictable losses to industrial production. Therefore, we must first understand the cause of PLC crash and investigate the cause. Software or hardware errors may cause PLC crash. The following are introduced separately:

1. Hardware

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

(2) The I/O is damaged. When the program runs to the point where it needs the feedback signal from the I/O, it cannot execute further instructions.

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

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

(5) The PLC connection module and address allocation module are faulty.

(6) Faults caused by cables.

2. Software

(1) An infinite loop is triggered.

(2) The program rewrites the contents of the system parameter area without initializing it.

(3) Protection program starts: hardware protection, limited usage time (for payment recovery)

(4) Data overflow, step length too large, watchdog (dog time can be modified) action.

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