When 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. Introduction:
1. Hardware (1) I/O power, PLC automatically detects I/O error and enters STOP mode.
(2) If the I/O is damaged, the program runs to the feedback signal that requires the 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 of the PLC and the address assignment module have failed.
(6) The fault caused by the cable.
2. The software aspect (1) triggers 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.
A through-bore slip ring is an electrical device that allows current to pass between two points in a rotating assembly without a physical connection. There is no break in the circuit. This is accomplished by passing the current through a rotating brush that contacts a stationary metal ring. The metal ring is mounted on the shaft of the assembly and provides a continuous path for the current.
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