Mingzhe Liu

Research on deterministic communication of industrial wireless based on WLAN

The shortages of WLAN applied to the field of industrial control are given by analyzing the communication mechanism of WLAN. In this article, it presents a new communication method with deterministic scheduler in order to satisfy requirement of industrial wireless communication. It selects beacon interval as communication macro cycle, and pre-selects a station as the coordinated station that is responsible for the maintenance accurate clock synchronization function within the BSA. In data link layer, packets from user layer are divided into periodic packets and non-periodic packets. In terms of devices configured information beforehand, the periodic packets would be sent by fixed time clock, while the non-periodic packets would be sent when it is polled by the coordinated station, herein, we selected polling algorithm with good performance in the aspect of adaptive. This is called deterministic scheduling. The deterministic scheduling mechanism put forward in this paper provides foundation for applying WLAN to the field of industrial control, and its deterministic communication methods is compatible with other commercial WLAN well.

Industrial wireless deterministic communication based on WLAN: Design, implementation and analysis

In this article, it presents the status of wireless communication being applied in industrial environment, and points out its deterministic communication issue existed in control network. According to this issue, a kind of industrial wireless deterministic communication mechanism and method based on WLAN is put forward. Afterwards, the main part is to describe the process of design, implementation and test programs. Depending on test results, some analysis is set out to indicate that the parameters performance of IWLAN with deterministic scheduling mechanism is better than commercial WLAN. At the end of this article, simulation result is supplied as the reference of actual IWLAN parameters performance.

Research of control system platform technology for IC equipment

With the development of road to 300 mm semiconductor wafer manufacturing, IC equipment control system not only implement its task scheduling, material transfer and process control, we must also consider the enterprise information integration, production scheduling and industry standards. This paper analyzes the semiconductor manufacturing process, control requirements, and presents a framework-style, modular IC equipment control system platform model, aimed at the complete system control functions at the same time, making the control of the semiconductor equipment greater flexibility, scalability, enterprise-class interactive capabilities, and in accordance with industry standards.

Research of material transfer software platform in IC equipment controlling system

This paper researches and develops a material transfer software platform using in the semiconductor equipment controlling system, this platform is developed by offering unified interfaces and developing independent software modules according to the common demand of the manufactures, and is applied in an experimental platform, the result shows that the platform software can effectively improve users development efficiency, and has good application prospects.

Research of Ethernet communication technology for motion control

For Ethernet-based motion control application, this paper analyze system function, system architecture, and performance requirements of motion control system, and proposed an improved Ethernet communication method. The method, which bases on the time slice and priority strategies, schedules data to be transmitted deterministically and meets the motion control real-time processing requirements without changing the fundamental communication mechanism of Ethernet. The final results of test verify the feasibility of Ethernet-based real-time control application for motion control.