ABSTRACT
This chapter considers the methods used to implement a control scheme using a distributed control system. One or more control schemes dedicated to a control requirement that is designed to operate the process equipment within its capability and give a particular required result to the product brings about process control. The controller setpoint is configured under the block parameter SPT and always represents the active setpoint of the controller. Despite the power contained in the PID algorithm, the desire to improve the control capability of the system resulted in the design and inclusion of the PIDA block in the system. The control strategy normally referred to in the system as a compound is associated with a part of the process or particular piece of plant equipment, and is assigned an appropriate and unique name. The control strategies are limited only by the ingenuity of the control engineer; the system should be able to cope in almost all cases.
