The PLC CPU. The main work is to be done in the process of control

The PLC CPU ( CPU generally consists of controller, arithmetic unit and register, these circuits are integrated on a chip. The CPU through data bus, address bus and control bus and storage unit, input/output interface circuit is connected. With general computer, CPU is the control of the PLC controller central, it according to the function of the command given by the PLC system program in the PLC to work in an orderly way. The CPU mainly completed the following work: ( 1) Receiving, storing user through programmer input devices such as the input of program and data. ( 2) By scanning the way through the I/O parts for on-site reception state or data, and deposited in the input image or data storage register. ( 3) Internal circuit of the fault diagnosis of PLC controller and programming of the grammatical errors, etc. ( 4) PLC to enter the running state, the user program, complete a variety of data processing, transfer and storage the corresponding internal control signal, in order to complete the user instructions provided various operations. ( 5) Response to a variety of peripheral devices ( As a programmer, printer, etc. ) The request. PLC adopts CPU on different models are different, at present, small PLC as the single CPU system, medium and large adopts double CPU even more CPU system. At present, there are three kinds of PLC controller used microprocessor: general microprocessor, single chip microprocessor ( The single chip microcomputer) The processor, a piece of weakness.
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