never fails. However, the cost of industrial wiring is so high, that wireless can usually be justified. This fourth edition includes a general update of events that have occurred since the previous edition. Most importantly, it includes an extensive analysis of new wireless technology intended for process control, such as ISA100 Wireless (ISA100.11a), WirelessHART, WIA-PA, and WiFi, including IEEE 802.11n and 802.11ac. |