| ACKNOWLEDGEMENTS | 第7-8页 |
| ABSTRACT | 第8页 |
| Chapter 1 Introduce | 第15-23页 |
| 1.1 Source and Significance of the Subject | 第15-16页 |
| 1.1.1 Source of the Subject | 第15页 |
| 1.1.2 Research significance | 第15-16页 |
| 1.2 Introduce of Monitoring System for Polyurethane Reactor | 第16-18页 |
| 1.2.1 Introduce and Utilities of Polyurethane | 第16-17页 |
| 1.2.2 Introduce of PET Resin and its Utilities | 第17页 |
| 1.2.3 Introduce of Reactor Monitoring System | 第17-18页 |
| 1.3 Main Work and Research Achievements | 第18-22页 |
| 1.3.1 Main contents of the Research Project | 第18-21页 |
| 1.3.2 Research Achievements | 第21-22页 |
| 1.4 Summary | 第22-23页 |
| Chapter 2 Overall solution design of the resin reactor monitoring system | 第23-35页 |
| 2.1 Processes of polyurethane production | 第23-25页 |
| 2.2 Process and Control Requirements of Polyurethane Reactor ControlSystem | 第25-27页 |
| 2.2.1 Process Requirements of Reactor Monitoring System | 第25-26页 |
| 2.2.2 Control Requirements of Polyurethane Reactor Control System | 第26-27页 |
| 2.3 Overall Design of Monitoring System for Polyurethane Reactor | 第27-34页 |
| 2.3.1 Introduce of Computer Control System | 第27-30页 |
| 2.3.2 Solution Design and Overall Architecture of the ReactorMonitoring System | 第30-34页 |
| 2.3.3 Realization of Communication for the Reactor Monitoring System | 第34页 |
| 2.4 Summary | 第34-35页 |
| Chapter 3 Hardware circuit design of the monitoring system | 第35-54页 |
| 3.1 Design of the General Distribution Circuit for the Monitoring System | 第35-37页 |
| 3.2 Design of Control Circuits for Reactor Motors | 第37-42页 |
| 3.2.1 Introduce and Selection of Soft Starters | 第37-38页 |
| 3.2.2 Design of control circuit for soft starter | 第38-42页 |
| 3.3 Design of Pump Valve Control Circuits for Reactor | 第42-47页 |
| 3.3.1 Design of Pump Control Circuits | 第43-45页 |
| 3.3.2 Design of Valve Control Circuits | 第45-47页 |
| 3.4. PLC Hardware circuit design | 第47-51页 |
| 3.4.1 Introduce of PLC | 第47-50页 |
| 3.4.2 Structure Design of PLC Control System | 第50-51页 |
| 3.5 Design of Reactor Weighing Circuit | 第51-52页 |
| 3.6 Design of Reactor Alarm Circuit | 第52-53页 |
| 3.7 Summary | 第53-54页 |
| Chapter 4 Software Design of the Monitoring System | 第54-71页 |
| 4.1 Introduce of STEP 7 | 第54-57页 |
| 4.2 Design of the main program | 第57-59页 |
| 4.3 Design of Pump Valve Control Program for Reactor | 第59-64页 |
| 4.4 Design of running indication program for agitating motors | 第64-66页 |
| 4.5 Design of analog acquisition program | 第66-68页 |
| 4.6 Program design for alarm circuit | 第68-70页 |
| 4.7 Summary | 第70-71页 |
| Chapter 5 Design of the HMI of the monitoring system | 第71-85页 |
| 5.1 Overview of configuration software | 第71-72页 |
| 5.2 Introduce of King View V6.55 | 第72-73页 |
| 5.3. HMI Configuration | 第73-84页 |
| 5.3.1 Design of technology screens | 第73-78页 |
| 5.3.2 Design of curve screen | 第78-82页 |
| 5.3.3 Design of the archiving screen | 第82-84页 |
| 5.4 Summary | 第84-85页 |
| Chapter 6 Conclusion and future work | 第85-87页 |
| 6.1 Conclusion | 第85-86页 |
| 6.2 Future work | 第86-87页 |
| References | 第87-90页 |
| Appendix 1 System distribution diagram | 第90-92页 |
| Appendix 2 Main control diagram for agitating motor of PU reactor 1 | 第92-94页 |
| Appendix 3 Main control diagram for agitating motor of PET reactor | 第94-95页 |
| Appendix 4 Main control diagram of pump valve 1 | 第95-97页 |
| Appendix 5 Main control diagram of PET pump valve | 第97-98页 |
| Appendix 6 Wiring diagram of PLC's digital input and output modules(partial) | 第98-100页 |
| Appendix 7 Wiring diagram of PLC’s analog input and output modules(partial) | 第100-102页 |
| Appendix 8 Weighing circuit wiring diagram of PU reactor 1 | 第102-104页 |
