Dissertation > Excellent graduate degree dissertation topics show

The Research on a Kind of Safe-control System Based on ePLC Technology

Author: LiuYang
Tutor: BaoJian
School: Hangzhou University of Electronic Science and Technology
Course: Computer technology
Keywords: ePLC redundancy technology IEC61508 safe PLC safety functional
CLC: TP273
Type: Master's thesis
Year: 2014
Downloads: 10
Quote: 0
Read: Download Dissertation

Abstract


This paper innovatively combined the ePLC technology with the redundancy technology,and presented a model called dual redundant ePLC model. The model is based on the analysisand research of existed safe-control technology and safety standards. It could make theordinary special controller convert to safe PLC with low cost, which can meet therequirements of the safety’s integrity. The paper mainly finished the following work:Firstly, study the existing safety standards about function safety and the mainarchitecture of foreign safe PLCs, then propose a dual redundant ePLC model. This modeldefines three kinds of modules, called control redundant module, input redundant module andoutput redundant module. They exchange data through a safety field bus.Secondly, improve the system software of ePLC, and make the software adapt to the dualredundant ePLC model. Added the synchronization mechanism, duel algorithm and monitorthread in the original engine code, and calculated the software performance loss caused by thenew synchronization mechanism.Thirdly, apply the dual redundant ePLC model to wind power control system.According to the practical application demand, design the redundant hardware in detail. Thedesign of hardware based on the principle of low coupling between redundancy elements, andhas used much technology of electrical isolation.Finally, analysis the average failure probability of PFD(Probability Failure on Demand)of the designed safe ePLC system by using the method of reliability block diagram. The paperhas also evaluated the security level of the system in accordance with the IEC61508standard.Modern control system is becoming more and more advanced and intelligent, at the sametime, the demand for control safety is also growing. The dual redundant ePLC model appliedby this paper has made some exploration and attempt in the field of control safety, however, itremains need field application’s test for a long time.

Related Dissertations

  1. For high-reliability automotive applications of the electronic control unit,TN402
  2. Study on Pharmacokinetics of Bupropion and Fasudil,R96
  3. The Research on CAN Bus Experimental System & Dual Bus Redundancy,TP273
  4. Electronically Programmable Fuse Structure Design Base on Cobalt Silicide Electromigration,TN402
  5. Safety Controller Design,TE978
  6. Data Acquisition System of Three-phase AC Switch Machine in Speed-raising Turnout,U284.72
  7. Applications of Redundancy in Railway Signaling Disaster Prevention System,TP273
  8. Triplex structure with four redundant flight control system structure Reliability Comparison Study,V249.1
  9. Redundant digital electro-hydraulic valve hydraulic steering system of the ship Application,U664.41
  10. Research and Contruction Emulsion Pump Station Intelligent of Monitor System Based on PLC,TP273
  11. Research on the Flameproof Intrinsically Safe Water Level Sensor about Measuring and Controlling,TP212
  12. Research of Key Technology of Industrial Robots on ePLC,TP242.2
  13. Network Technology Research and Application Siemens Industrial Control,TP273.5
  14. Research and Design of Can-based Remote Control System of Marine Main Engine,TP872
  15. Research of Safety Instrumented System and Design Method Analysis,TP273
  16. Chengdu pig products quality and safety traceability information system,TP315
  17. Research and Application on Intelligent Temperature Control System of Furnace Based on ePLC,TP273
  18. Design of the Appropriative Railway Interlock System for Lanzhou Petrochemical Company,U284.3
  19. Research on Functional Safety-Critical Degree of Mechanical&Electrical Products,TH-39
  20. Research and Application of Functional Safety in Industrial Process Safety Instrument,X924.4

CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
© 2012 www.DissertationTopic.Net  Mobile