a collection of instruments and control algorithms arranged in such a fashion as to regulate a variable at a setpoint or reference value

a process management system designed to maintain a process variable at a desired set point

A Control Loop is a group of Function Blocks (FBs) that execute at a specified rate within a fieldbus device or distributed across the fieldbus network.

A combination of two or more instruments or control functions arranged so that signals pass from one to another for the purpose of measurement and/or control of a process variable. See closed loop and open loop.

The path through the control system between the sensor, which measures a process variable, and the controller, which controls or adjusts the process variable.