Open-loop controller: Difference between revisions

Revision as of 02:42, 8 February 2017

Revision as of 02:42, 8 February 2017

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[[File:Remote manipulators 003.jpg|thumb|upright|[[Remote manipulator]] arms for working with radioactive materials – an open-loop mechanism, controlled by hand controls.]]

Fundamentally, there are two types of control loop: open loop control, and closed loop (feedback) control.(feedback) control.

In open loop control, the control action from the controller is independent of the "process output" (or "controlled process variable"). A good example of this is a central heating boiler controlled only by a timer, so that heat is applied for a constant time, regardless of the temperature of the building. The control action is the switching on/off of the boiler. The process output is the building temperature.