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Answer Posted / faiyaz ahmad
DO-Digital out put its used to control the ESD system PSD system means ESD valve and PSD valve which one control through the DCS that is called Digital out put which signal coming from in DCS like proximity switch limit switch and proximity sensor means its on/off it is called Digital in put.and all the transmitter is analog input like pressure transmitter level transmitter flow transmitter and temperature transmitter and all the fire and gas system is analog input and 4 to 20 mA signal is analog out put like control valve
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