19 WirelessHART
19.1 INTRODUCTION
Wireless Highway Addressable Remote Transmission (WirelessHART or WHART), like ISA100.11a, is fast becoming an emerging standard in industrial wireless communication arena that promises to revolutionize the process control and automation industry. Existing wireless technologies such as Bluetooth, ZigBee, or WiFi cannot be used in industrial plants because of their inherent drawbacks. Bluetooth is primarily targeted at personal area networks (PAN) whose range is limited to within 10 m. Furthermore, Bluetooth supports only the star-type network topology with a master having a maximum of seven slaves. This obviously limits its application in process industries. Although ZigBee supports direct sequence spread spectrum ...
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