Circuit for providing a common setpoint for manual and automatic regulation of a process control system

摘要

A circuit for providing a common setpoint for both automatic and manual operation of a process control system includes a process controller. A parameter of the process can be changed by changing the output of a controller. A variable input voltage to the process controller establishes the setpoint of the parameter. Changes in the variable voltage are made either manually or automatically so that a common setpoint is established for both types of operation.