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Egmec Industry Co., Ltd. [China (Mainland)]
Business Type:Manufacturer, Trading Company, Agent
City: Ningbo
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Country/Region: China (Mainland)
Electronic Amplifiers
The Relationship Between The CPU And The PLC
CPU is the core of the PLC, since the role of the nerve center, at least one CPU in each PLC, the PLC system program, the functions entrusted to the reception and storage of user programs and data collected from field input devices sent a scanned state or data, and deposit shall be required to register, at the same time, the diagnostic power and the working status of the PLC internal circuitry and programming process in syntax errors. Into operation from the user program memory, one by one read command, the corresponding control signal analysis and then according to the mandate of instruction, to command the control circuit.
CPU is the main contact between the computing device, controller, register, and to implement them, control and status bus, a CPU unit also includes a peripheral chips, bus interface, and related circuit. Memory is mainly used for storing programs and data is an integral unit in PLC.
User opinion, unnecessarily detailed analysis of the internal circuitry of the CPU, but on the part of the working mechanism should have sufficient understanding. The CPU controller controls the CPU to read instructions, which explain the instructions and execute instructions. However, the pace of work is controlled by the oscillation signal. The arithmetic unit is used for digital or logic operation under the command of the controller. Register to participate in operations, and store intermediate results of operations, it is under the command of the controller. CPU speed and memory capacity are important parameters in the PLC, they determine the pace of work of the PLC, IO number and software capacity, thus limiting the size of the control.
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