ppt

Overview, composition and principle of PLC

  • 2013-09-22
  • 1.09MB
  • Points it Requires : 1

Programmable logic controller originated in the 1960s, referred to as PLC (Programmable Logic Controller). At present, it has been widely used in metallurgy, mining, machinery and other fields. PLC adopts a typical computer structure, mainly composed of CPU, RAM, ROM and specially designed input and output interface circuits. With the continuous development of industrial production, PLC has become one of the three pillars of modern industrial automation with robots and computer-aided design and manufacturing. In recent years, the research, production and application of PLC in my country have also developed rapidly. The basic structure of programmable controller CPU module Microprocessor + memory The brain and heart of PLC Input-execution-output I/O module The eyes, ears, hands and feet of the system Input: switch quantity, analog quantity Output: actuator (contactor, solenoid valve, regulator, speed regulation) Programmer Edit user program Monitor PLC status Power supply Provide power for the system

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