Networked Control Systems Theory and Application MI CHEN Graduate student School of Technology Eastern Illinois University 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Networked Control Systems Theory and Its Application Introduction Advantages and disadvantages Related issues My current focus Questions and remarks? 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Point to Point Architecture Model Introduction Point to point architecture System components are directly wired to various controllers. controllers Point to Point Architecture Model 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Introduction The trend of modern manufacturing control system Advanced Integrated system Reconfigurable system Distribute control and intelligence devices 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Definition of Networked Control System(NCS) NCS is a completely distributed and networked real-time feedback control system. It is an integration of sensors, controllers (+estimators), actuators and communication network of certain local field and is used to provide data transmission between devices in order that users of different sites can realize resource sharing and coordinating manipulation. 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Typical NCS model The Model of a Networked Control System 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Advantage of NCS vs. Point-to-point Interconnected Control System Increase system reconfigurability Enhance resource utilization and reliability Reduce installation and maintenance cost. Support the distribute control and intelligence devices 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Disadvantage of NCS Time-delay It is including network delay and controller processing delay that degrade performance and can even cause instability It varies with network topology, network protocol, network load, and hardware Its value may be constant, bounded, unbounded, and random Existing time-delay control methodologies may not suitable for controlling a system over the network 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Related research issues of NCS Network system Networked devices Control system NCS research methodology 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Network System Network system is classified as data network and control network Size of data packets Frequency Numbers of nodes If meet time-critical requirement Data network large Infrequent Small No Control network Frequent Large Yes Comparison of the date network and control network 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Key components of control networks Network architecture Network protocol 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

Network Architecture WORKSATION SERVERS WAN WORKSATIONPC LAN 4.CORPORATE MANAGEMENT LEVEL WORKSATION SERVERS WAN 3.PLANT MANAGEMENT LEVEL WORKSATIONPC LAN CNC PLC PC 2.Cell control level Fieldbus Sensors Actuators 1.Sensor-actuator level Sensorbus 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Network Protocol CAN(Controller Area Network) Profibus Fieldbus DeviceNet Ethernet 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Networked Devices Sensors and Actuators Data acquisition, communication ability and intelligence Controllers Handle the decentralized information as well as the centralized information Provide a HMI(Human Machine Interface) to the operators or management level. 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Networked Devices Actuator Input Sensor output Plant Network Controllers Network Reference Input 2019/5/27 NCS Model ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Control System Direct structure 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Control System Hierarchical structure 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li My Current Focus Study the advantages of a distribute architecture, and the impact or networked induced delays on control performance Install a Ethernet network system on the robotics A simulation model of NCS has been implemented in Matlab/simulink Design considerations will include network parameters as well as control parameters 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li

ZJU-NLICT-NCS Research Group By Shanbin Li Questions and Remarks? 2019/5/27 ZJU-NLICT-NCS Research Group By Shanbin Li