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The control in Fieldbus philosophy is more distributed then DCS, at field instruments level. Advance Process Control comes in whenever upgradation of ammonia plant is concerned. The APC is based on Predictive Multivariable Controller which takes some really critical and performance affecting variables from different sections of the plant and in turn generates setpoints for the conventional DCS, within some predefined constraints, which are otimized economically and from an operational point of view.
This seems OK in DCS but in Fieldbus it needs some serious thought as the PID control is implemented in field devices by incorporating the functional blocks.
The question is: How would it be possible for APC algorithim to first of all gather var. values from plant and then generate optimized setpoints to field devices?
Your replies are requested...
This seems OK in DCS but in Fieldbus it needs some serious thought as the PID control is implemented in field devices by incorporating the functional blocks.
The question is: How would it be possible for APC algorithim to first of all gather var. values from plant and then generate optimized setpoints to field devices?
Your replies are requested...