The core component of PLC, — CPU and memory is introduced

Is the core component of PLC CPU and memory: ( 1) The central processing unit ( CPU) The central processing unit ( CPU) Is the control center of the PLC. It according to the function of PLC controller system program to accept and store the type in the user program and data from programmer and check that the power supply, memory, I/O and warn the timer state, and can check the user program syntax errors. When PLC in operation, the first it accepted in the form of scanning state of each input device and data, and deposited in the I/O image area respectively, and then passes from the user program memory read the user program, after command interpretation shall be governed by the provisions of the directive logic and arithmetic tasks. Logic and arithmetic and the result was sent to the I/O image area or in a data register. Etc. All of the user program execution is completed, the last I/O image area of each output state or output register data sent to the corresponding output device, so cycle run, until it stops. ( 2) Memory like a microcomputer, in addition to hardware, also must have the software. To constitute a complete PLC. PLC software is divided into two parts: the system software and application software. Memory storage system software called system program memory. PLC storage space allocation: although large, medium and small PLC CPU maximum addressable storage space each are not identical, but according to the working principle of PLC controller, its storage space generally includes the following three areas: system program storage area, the system RAM memory area ( Including the I/O image area and the soft system equipment, etc. ) And the user program memory area.
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