Introduction

1. 1 • Introduction • DCS Structure • Why NCSs ? • Factors Affecting NCSs Performance • Modeling of NCSs with Network–Induced Delay Delay / Sampling Time Ratio Effect  NCSs Design Approaches Candidate NCSs Control Strategies  Results  Conclusion & Future Trends

2. 2 Control Network Introduction  What is Networked Control Systems ? Data Networks Versus Control Networks Concept of Distributed Control Systems

3. 3 Local Data Links DCS Structure

4. 4 Why NCSs ? • Easy Problem Diagnostic • Less Expensive • Complexity Management • Pervasive Flow of Mixed Data • Attractive Features of Serial Communication Network

5. 5 Delay Mis-Sync NW Architecture NCS Buffer Saturation Noise Sampling Time Factors Affecting NCSs Performance

6. 6 Modeling of NCSs with Network-Induced Delay Delay Models • Constant • Random

7. 7 Delay < Sampling Period Longer Delays Delay/Sampling Time Ratio Effect

8. 8 Existing NW NW To Be Designed Select Communication Protocol Delay is A Given Condition Control Strategies Minimize Delay NCSs Design Approaches Begin

9. 9 Ethernet ControlNet DeviceNet MAC CSMA/CD Token Bus CSMA/AMP Overhead 26 byte 7 byte 47 bit Data Size 46-1500 B 0-510 B 0-8 B O.H Small Data More Okey Less Large Data Less Okey More Data Rate (Mbps) 10-100 5 0.5 C.E Small Data Large Data Worst Okey Best 98% 98% 58% Candidate NCSs

10. 10 Simulation of a Real Dial-Up Internet Connection www.shunra.com www.yahoo.com

11. 11 Control Strategies • Phase Lead & Phase Lag • Pole Placement • State Estimator • Deadbeat Results

12. 12 Conclusion  Concept of NCS Focus on Delay Problem Proposed Solutions • Candidate Networks • Design Control Strategies Phase Lead Works Well Pole Placement is Delay Dependent State Estimator is the Best for Loss Deadbeat is the Fastest One

13. 13 Future Trends Hardware Implementation • DC Motor • Applying a Control Strategy Simulation on IUG Network

14. 14 For More Information Visit Our Website On: W W W . N C S I U G . 8 m . C O M

15. 15 Thank You For your Good Listening