Measuring real time performances of PC-based industrial control systems

The virtualization technology has a great potential to improve the manageability and scalability of industrial control systems, as it can host and consolidate computing resources very efficiently. There accordingly have been efforts to utilize the virtualization technology for industrial control systems, but the research for virtualization of traditional industrial real-time networks, such as Controller Area Network (CAN), has been done in a very limited scope. Those traditional fieldbuses have distinguished characteristics from well-studied Ethernet-based networks; thus, it is necessary to study how to support their inherent functions transparently and how to guarantee Quality-of-Service (QoS) in virtualized environments. In this paper, we suggest a lightweight CAN virtualization technology for virtual controllers to tackle both functionality and QoS issues. We particularly target the virtual controllers that are containerized with an operating-system(OS)-based virtualization technology. In the functionality aspect, our virtualization technology provides virtual CAN interfaces and virtual CAN buses at the device driver level. In the QoS perspective, we provide a hierarchical real-time scheduler and a simulator, which enable the adjustment of phase offsets of virtual controllers and tasks. The experiment results show that our CAN virtualization has lower overheads than an existing approach up to 20%. Moreover, we show that the worst-case end-to-end delay could be reduced up to 78.7% by adjusting the phase offsets of virtual controllers and tasks.

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Development and Design of the Pull Detection System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.765-767.2134 ◽

2013 ◽

Vol 765-767 ◽

pp. 2134-2139

Author(s):

Fei Zhang ◽

Hong Ding ◽

Bao Guo Yao

Keyword(s):

Control Systems ◽

Real Time ◽

Personal Computer ◽

Detection System ◽

Configuration Software ◽

Industrial Control ◽

Communication Interface ◽

Industrial Control Systems ◽

Different Types ◽

Application Programming

Because the industrial control systems were often used in different manufacturers and different types of equipment, how to uniform the different equipment communication interface was a big problem. The real-time communication between Personal Computer and S7-200 PLC had been achieved by using the Siemens configuration software PC access and VC++ application programming. The pull detection system was designed by using this OPC method. In the paper the client design and the modular program design of the pull detection system were explained in details. At present, the system was used in the factory and it was running stable with good results.

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Real-time modeling for industrial control systems

2010 IEEE 15th Conference on Emerging Technologies & Factory Automation (ETFA 2010) ◽

10.1109/etfa.2010.5641249 ◽

2010 ◽

Cited By ~ 1

Author(s):

E Estévez ◽

M Marcos ◽

E Irisarri

Keyword(s):

Control Systems ◽

Real Time ◽

Industrial Control ◽

Industrial Control Systems ◽

Time Modeling

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Design and Implementation of Embedded Web Server in Industrial Control Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.2658 ◽

2013 ◽

Vol 380-384 ◽

pp. 2658-2661

Author(s):

Jian Ming Liu ◽

Yun Jie Zhang ◽

Li Li Xu

Keyword(s):

Control Systems ◽

Real Time ◽

Production Condition ◽

Operating Cost ◽

Web Server ◽

Control Mode ◽

Embedded Web Server ◽

Industrial Control ◽

Industrial Control Systems ◽

Embedded Web

In the traditional project of industry control, the field operator is the only man who watches production condition at the production spot. Enterprise administers cannot obtain real-time production status and make real-time decision if they dont reach the production spot. Because of the development of Embedded Web Server such status is being changed. The remote monitor and control mode based on Embedded Web Server provides complete exact real-time information for managers, and makes it possible to make a decision in real time. In the paper, the design and implements of Embedded Web Server are presented and the key realization technology of it is described in detail. EWS (Embedded Web Server) will effectively lower system operating cost and improve maintaining efficiency, which has wide application prospect and popularization value in industrial control systems.

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