How do you develop and implement control strategies in a DCS?

DCS control strategy development: define process requirements (control objectives, constraints, operating modes), select control scheme (regulatory, advanced, multivariable), configure function blocks (PID, ratio, cascade, feedforward) in graphical programming environment, establish I/O connections and scaling, configure alarming (setpoints, priorities, acknowledgment requirements), develop sequences (batch, startup/shutdown), test in simulation (offline verification before download), and commission with process (tuning, verification). Documentation: control strategy descriptions, loop sheets, cause and effect diagrams. Use DCS templates and standards for consistency. Consider: failure modes, operator interface requirements, and historian requirements. Test all operating modes including failure scenarios.