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Answer Posted / engg.furqan@hotmail.com
Field bus is a protol how to communicate field instruments with DCS scada etc..
there is segment protector installed at field side in which number of instruments connected on segment protector (upto 12 instruments connected on 1 segment protector) , from segment protector single pair of wire goes to the DCS where FF linking device communicated number of instruments connected on 1 segment protector .
(Field bus system is use in many industries for reduce cable cost etc)
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