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PC-PLC Control System Design

Author: DaiLiang
Tutor: ZhouYong
School: East China Normal University
Course: Software Engineering
Keywords: PLC Object-oriented design Common Runtime
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 799
Quote: 1
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Abstract


PLC Programmable logic Controller programmable logic controller , it is a kind of digital electronic computers operating system , specifically designed for applications in industrial environments . PLC uses a programmable memory for internal storage program , the implementation of logical , sequential control, timing, counting and arithmetic operations , and through digital or analog input / output , and control of all types of machinery or production processes . PLC is a core part of the industrial control . With the wide application of PLC in the industrial , occasions that require a PC and PLC work together more and more. This control system is often referred to as PC - PLC control system . PC - PLC control system has not yet formed a mature development standards or frameworks , the development of such a system , there is often a low compatibility , high complexity, development costs are difficult to control and run unstable , and many other issues . In order to solve these problems exist in the development of PC - PLC control system , the paper first studies and summarized the PLC hardware components of the structure , work processes , existing programming languages ??as well as with the PC to communicate using the protocol , analyzed using ladder programming language the advantages and disadvantages of the PLC program development . In this paper, the the PLC working process and process-oriented , object-oriented programming method compares prove to object-oriented approach to the development of PC - PLC control system is feasible , based on object-oriented design PC-PLC common framework for the control system , and illustrate how the framework works . Generic framework proposed multi-threaded implementation of this framework call control , control and error control methods described . Paper laser engraving machine PC-PLC the stepper control part of the control system to achieve completion of the last two steps , for example , opposite to verify the validity of the common framework . Introduced including conversion formula , the important part of the class design and code implementation on the hardware configuration , stepper control principle , moving distance and pulse current number . Finally , this work is summarized and future direction .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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