Field devices in factory automation and process control systems generate time-critical, periodic, and time-available data. These data share the bandwidth of one fieldbus network medium. This paper reviews a bandwidth allocation scheme (BAS) that is applicable to many different kinds of fieldbuses. The BAS satisfies the real-time transmission requirements of time-critical and periodic data, and ...

A case study of two-level and set point-oriented controls in complex industrial heating plants has been carried out. Task-oriented controls occur at command and supervision level in conjunction with human process operator, while set-point controls occur at regulation level of energy conversion and heating process. Fuzzy logic control is involved on the second control level on the basis of produ...

In this report, we propose a system for vision guided autonomous circumnavigation, allowing robots to navigate around objects of arbitrary pose. The system performs model-based object/view recognition from an intensity image using a canonical viewer-centred model. A path planned from a geometric model guides the robot in circumnavigating the object. This system can be used in many applications ...

Zhi WANG Ye_qiong SONG 2 Hai-bin YU Youxian SUN 1 National Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China 2 LORIA–ENSEM, 2, av. de la Forêt de Haye, 54516 Vandoeuvre-lès-Nancy, France 3 Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, 110016, China Author of correspondence: [email protected] Abstract: This paper presents an ...

In this paper, we propose a high performance system bus that facilitate real-time data transfer in programmable controllers used in factory automation. The proposed bus splits and merges bit data at hardware level and increases data-transfer eeciency. It provides a guaranteed tight real-time bound for normal periodic data transfer between the processing elements. The ability to facilitate urgen...

As the demands for reliable, real-time automation and process control in industrial environments increase, an Industrial Ethernet cabling system quickly becomes the most attractive solution. Cables used in industrial environments must be designed to work in harsh environments of temperature extremes, humidity, and vibration. Many times this can exceed the ranges for information technology equip...

Safety-critical systems are subject to rigorous safety analyses, e.g., hazard analyses. Fault trees are a deductive technique to derive the combination of faults which cause a hazard. There is a tight relationship between fault trees and system architecture as the components contain the faults and the component structure influences the fault combinations. In this paper, we describe an explorati...

At present, distributed real-time applications flourish, including the military systems, telecommunications, factory automation, traffic control, financial trading, medical imaging, and so on, these applications will need to make real-time reliable data transmission. Publish/Subscribe interaction scheme is very suitable for distributed communications system applications. In this paper, based on...

A system architecture is proposed for integrating sensors, controllers, actuators and instrumentation within a common framework. The goal is to provide a flexible and scalable system. Extending the system, by adding additional components such as sensors or actuators, does not increase the overheads and is achieved seamlessly with minimal modification of the core controller program. The architec...

This paper analyzes an existing maintenance management system in a cement factory in the Kingdom of Saudi Arabia using a modified questionnaire. The analysis shows that there are strong areas such as predictive maintenance and maintenance automation. Other areas are found weak such as training programs and maintenance reporting. Some areas are found mix between strong and weak such as maintenan...