1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

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

12. 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

13. 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

14. 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

15. 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

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

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

18. 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

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