Description
P0971XU
INTERFACE CABLE
The definition of plc plc is called programmable controller. It is a special electronic computer for digital operation, which is based on the mature and effective relay control concept and design idea, and gradually forms various series of products with characteristics by using the constantly developing new technology and new electronic devices. It is a device that stores logic operation, sequence control, timing and counting, arithmetic operation and other control programs in memory in the form of a series of instructions, and then controls production equipment and production process through analog, digital and other input and output components according to the stored control content.
2.2 Development of plc In 1969, DEC developed the world’s first plc according to the requirements of gm (General Motors Corporation of America) and successfully applied it in gm. After that, the company commercialized plc. Plc is specially designed to compete with relay products and gradually replace the traditional relay. Plc, as a special industrial computer, has experienced the following development processes.
1969-1972 is the first stage of PLC, which is the initial stage of PLC. In this stage, the PLCs of various manufacturers are very different, there is no unified hardware and software standard, the function is simple, and the specificity is strong. The hardware is mainly separated components, and the volume is large, the performance is poor, and the reliability is not high.
1972 – is the second stage, in which plc gradually evolved into a special industrial computer, with greatly improved reliability and greatly reduced cost, the appearance of process-oriented ladder diagram and statement table language, and the gradual transition of the system to standardization, all of which laid the foundation for the popularization of plc.
From 1981 to now, iec has officially published the standard of plc, and the plc of all manufacturers are developing towards standardization. Ladder diagram, statement table and sfc language have matured, and there is also interface with advanced programming language. Its storage capacity, operation speed, and processing function of analog quantity have been greatly enhanced. Now large and medium-sized plc has the classical pid algorithm, slope function, adaptive algorithm, fuzzy control and other algorithms that were “unique” to dcs. P56H5047G module
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