What does the control hierarchy for a fieldbus system look like (with control in the field)?
Your choice! Mix and match if you like; you can put the regulatory control loops in the field if you wish, with advantages of performance and reliability. Complex control functions will stay in the DCS. Supervisory functions, data analysis and links to management systems stay where they are now, but perhaps take extra data directly from field devices by pass-through via the DCS. The right level to put any function is the lowest at which all the necessary information is available. (For example, it’s probably not useful to put an interactive controller out on a bus segment, if it needs data from devices on another bus segment.
Your choice! Mix and match if you like; you can put the regulatory control loops in the field if you wish, with advantages of performance and reliability. Complex control functions will stay in the DCS. Supervisory functions, data analysis and links to management systems stay where they are now, but perhaps take extra data directly from field devices by pass-through via the DCS. The right level to put any function is the lowest at which all the necessary information is available.
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