Integration of mobile vehicles for automated material handling using Profibus and IEEE 802.11 networks

This paper focuses on a method to integrate mobile devices such as a mobile robot, automated guided vehicle, and unmanned container transporter to form an automated material handling system. In this paper, the stationary devices are connected via a Profibus network while the mobile devices are communicating via an IEEE 802.11 wireless LAN. In order to integrate these two networks, a protocol converter is developed on a PC platform that runs two interacting processes with shared internal buffers. The protocol converter performs a role of translator between two different protocols by converting the format of a data frame. In addition to this basic conversion function, the protocol converter has a virtual polling algorithm to reduce the uncertainty involved in accessing the wireless network. Finally, the integrated network. of Profibus and IEEE 802.11 is experimentally evaluated for its data latency and throughput, which shows the feasibility of the Profibus-IEEE 802.11 network for industrial applications involving mobile devices.

[1]  I. Chlamtac,et al.  BRAM: The Broadcast Recognizing Access Method , 1979, IEEE Trans. Commun..

[2]  William Stallings,et al.  Data and Computer Communications , 1985 .

[3]  J. LaTourrette,et al.  MBRAM-a priority protocol for PC based local area networks , 1988, IEEE Network.

[4]  D. A. Roberts,et al.  'OLCHFA' a distributed time-critical fieldbus , 1993 .

[5]  Kaveh Pahlavan,et al.  Trends in local wireless networks , 1995 .

[6]  R. Braden,et al.  Resource reSer Vation Protocol (RSVP) , 1997 .

[7]  Jaehyun Park,et al.  An extended TCP/IP protocol for real-time local area networks , 1998 .

[8]  Salvatore Cavalieri,et al.  A novel solution to interconnect FieldBus systems using IEEE wireless LAN technology , 1998 .

[9]  Raj Jain,et al.  Resource Reservation Protocol (RSVP) , 1999 .

[10]  Stuart Bennett,et al.  PID control for a distributed system with a smart actuator , 2000 .

[11]  Stefano Vitturi.  Some features of two fieldbuses of the IEC 61158 standard , 2000 .

[12]  J. Haehniche,et al.  Radio communication in automation systems: the R-fieldbus approach , 2000, 2000 IEEE International Workshop on Factory Communication Systems. Proceedings (Cat. No.00TH8531).

[13]  Suk Lee,et al.  On-line fuzzy performance management of Profibus networks , 2001, Comput. Ind..

[14]  Andreas Willig,et al.  Ring stability of the PROFIBUS token-passing protocol over error-prone links , 2001, IEEE Trans. Ind. Electron..

[15]  James Moyne,et al.  Performance evaluation of control networks: Ethernet, ControlNet, and DeviceNet , 2001 .

[16]  David Clark,et al.  An analysis of TCP processing overhead , 1989 .