Last updateThu, 06 May 2021 8pm


Sorting Out Wireless Standards for Smart Valves and Actuators

sorting_out_wireless_standards_for_smart_valves_and_actuatorsBack in the ’90s Profibus and Foundation fieldbus competed to replace 4-20 mA communication for field devices like valves and process transmitters with all-digital systems. This was supposed to save a great deal of money on cabling and make possible a new world of smart field devices that could be diagnosed and recalibrated in the field. HART, which put a digital signal on top of the existing 4-20 mA loop, was already there but was considered outmoded by promoters of the new buses.


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