Structure plc cpu control has two components: one is at the core of the micro-micro stored program control mode; one is hard-wired logic-based profibus module plc structure.
Micro microcode store holding, for each code corresponding to a basic micro-micro-operations, also known as the microinstruction; each instruction is composed of a different plc sequence of events module of microcode, the microcode sequence constituting the microprogram. After the central processor decodes the instruction that certain timing control signals, according to the order given sequence to beat the micro cycle performed by the microcode identified a number of micro-operations, to complete the execution of an instruction.
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