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Answer Posted / biswajit pradhan
DO are digital outputs,that are given by controllers which may b a plc or dcs.it has only two states 1 or 0
ex- command from plc or dcs to open or close a valve is a DO generated.
DI are digital inputs that a controller whether plc or dcs receives from field.it also has 2 states 1 or 0.
ex- if a proxy sensor senses in fIeld,the feedback from proxy is a DI.
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