In the super market, public building, bank, hospital entrances, often use automatic control system.Automatic control system of early logic control, and adopts relays has gradually be eliminated.Due to the high stability and PLC environmental adaptability, PLC automatic control device in the application are also increasingly wide.Also marks the automatic control field became a member of the digital age.It is practical, complete functions, advanced technology, make people believe that it is the results of scientific and technological progress. It makes humans understand, the development of digital era will change our lives will speed up the development of science and technology in future.
Automatic control system by measurement sensor, relays, programmable logic controller (PLC), motor. It is the main gate to the signal, the detection of the signal to the programmable logic controller (PLC), by programmable controller to signal processing and handling of the final result by relays, thus achieved the output control dc rotation. Driven by motor and the door open and shut. When the motor, the door is opened, When the motor, the door shut down automatically when the reverse.
