PURPOSE: a kind of PLC CPU modules have the technology of the program storage of dual structure and are provided to processing using identical for handling a large amount of ladder programs and are downloaded a large amount of ladder programs that is downloaded and stores the program by the reprogramming memory of structure by on-line continuous. ;CONSTITUTION: one first program storage (124) is downloaded and stores a large amount of ladder program from program loader. Second program storage (134) is downloaded and stores a large amount of ladder programs that new blocky ladder program continues to run. Microprocessor (110) handles these two kinds a large amount of ladder programs, leads to processing sequence to store the processing with data storage (150). ;The 2010 of copyright KIPO submissions
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