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Wireless communication is already widely used in industrial automation applications. Many solutions are available which consider industrial related requirements more or less. Thus, reliability and performance with respect to the specific requirements are the main concerns of industrial automation system users. Some of the wireless solutions base on the well-known Wireless LAN. The development of IEEE 802.11 was driven by the demand on highest possible data rates e.g. for video streaming applications. This paper proves whether the increased bit rates are appropriate to the requirements of industrial automation applications. A test methodology is introduced which can be used to get the necessary characteristic parameters with respect to the application field industrial automation. The impact of bit rates on packet loss probability and therefore on the performance is analysed. Together with the transmission time for a successful transmission with one attempt a cost function has been developed. It shows for WLAN solutions, that the highest bit rate is not adequate to meet the reliability and performance requirements of industrial automation applications.

IMPACT OF DIFFERENT BIT RATES ON PERFORMANCE CHARACTERISTICS OF INDUSTRIAL WLAN SOLUTIONS