IS200PSCDG1A
IS200PSCDG1A
IS200PSCDG1A
capacity requirements above 2A, can directly drive the contactor, etc.; ⑨ The original system changes the least when scaling; ⑩ User memory greater than 4KB. In fact, these conditions put forward the idea of combining the advantages of simple, easy to use and low price of relay control with the advantages of perfect function, flexibility and universality of computer, and transforming the hard-wired logic of relay
contacter control into the software logic programming of computer. In 1969, the United States Digital Equipment Company (DEC company) developed the first programmable controller PDP-14, in the United States General Motors Company on the production line trial success, and achieved satisfactory results, programmable controller was born. Since the advent of programmable controller, the development of extremely rapid. In 1971, programmable controller production began in Japan. Production of
programmable controllers began in Europe in 1973. Until now, some of the world’s famous electrical factories are almost all producing programmable controller devices. The programmable controller has been included in the production as an independent industrial equipment, becoming the leading electronic control device of the contemporary. From the development history of programmable controller, we can know that the function of programmable controller is constantly changing, and its name evolution has experienced the following process: The early product name was “Programmable Logic Controller” (PLC), which mainly replaced traditional relay contact control systems. With the development of microprocessor technology, the functions of programmable controller are also increasing, so programmable logic controller (PLC) can not describe its multifunctional characteristics. In 1980, the Electrical Manufacturers Association of
