Based On The PLC Centrifugal Blower Control System Design And Implementation

Programmable logic controller(PLC), since its invention, has been used in many industries and spread all over the world at a high rate. It is all all-purpose digital computer for automation electromechanical processes, integrating skills of computer, automation and communication.The purpose of this research is the use of PLC as a blower automatic control system to achieve automatic car needs more and more users, and be able to simply click a button, a key to boot, the blower automatically complete the boot initializationautomatic unit operation load will soon reach the point of work incorporated into the user’s pipe network, and automatically cut after the grid to coordination plate control all running blower gas within the user’s pipe network through the coordination of the disk is automatically assigned to fill a centrifugal blowerautomatic coordinated control system in the domestic blank.The main content of the thesis is as follows:First, analysis of centrifugal blower structure, working principle and performance curve, and expounds its characteristics and requirements of the control system.Then, introduced the PLC basic characteristics, existing problems and development focus.Thirdly, clearly the overall design philosophy of the centrifugal blower control system, the blower-analysis of the functional requirements and technical specifications of the control system hardware design, and completed the wiring diagram of the system I/O list and the PLC modul.Finally, through various analysis and consideration to determine the structure of the PLC control program and HMI configuration screen, developed on the basis of the system software function modules, and gives one of the important features of the code, focusing on the centrifugal blower automatic Kaivehicles, automatic parking, automatic and grid of logic functions to achieve.The selection of the design of the centrifugal blower unit control system described in this article, the I/O list design, system hardware design and software programming to achieve the control function of the centrifugal blower provides a reference for the further study of the centrifugal blower control.