MITSUBISHI PLC’s PROG light

The main reason is that the program written by PLC has made mistakes, some of which may be logical errors, or may be input errors. You have to check it out.
Programmable logic controller (programmable logic controller), which uses a class of programmable memory used in its internal storage program, executes user oriented instructions such as logic operation, sequence control, timing, counting and arithmetic operation, and controls various types of machinery or production process by digital or analog input / output.

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