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Description
The 1756-DHRIO is a programmable controller.
At the end of the 1756 – DHRIO programmable controller is in the ’60 s first appeared in the United States, was called a programmable logic controller PLC (ProgrammableLogicController), the purpose is to replace relay, to perform logic, timing, counting and other sequence control function. The basic design idea of PLC is to combine the advantages of computer function perfect, flexible and universal and the advantages of relay control system simple and easy to understand,
easy to operate and cheap, and the hardware of the controller is standard and universal. According to the actual application object, the control content is compiled into software and written into the user program memory of the controller. Easy connection between controller and controlled object. With the development of semiconductor technology, especially microprocessor and microcomputer technology, after the mid-1970s, PLC has been widely used as a central processor, input and output modules and peripheral circuits are also used in the medium, large-scale or even very large scale integrated circuits, then the PLC is no longer a logical judgment function. It also has the functions of data processing, PID regulation and data communication. A programmable controller (PLC) is a digital arithmetic operated electronic system designed for use in industrial environments. It uses a programmable memory to store instructions for performing operations such as logic operations, sequence control, timing, calculation and arithmetic operations, and to control various types of machinery or production processes through digital and analog inputs and outputs. PLC is a combination of microcomputer technology and traditional relay contact control technology, it overcomes the shortcomings of complex connection, low reliability, high power consumption, versatility and flexibility of the mechanical contact in the relay contact control system, and makes full use of the advantages of the microprocessor.
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