plc cpu control means, is mainly responsible for decoding the instruction, and sends control signals to each instruction to complete execution of each operation.
Simple instructions by plc digital io module consisting of micro-operations, complex instructions have to operate even by a few dozen to several hundred micro-component micro-operations.
Hard-wired logic controller is entirely composed of random logic. After the plc programmable intelligent controller decoding logic controller through a combination of different gates, the timing signals of different control sequences sent directly to the execution of each instruction operation.
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