All Controllers have an additional set of inputs (unrelated to the method-specific inputs) that impact their behavior. In particular, the Controller can be triggered “On” or “Off”. This is done at the bottom of the dialog:
Note that the drop-list contains three options:
- Not used (the default)
- Initially On
- Initially Off
If “Not Used” is selected, the two buttons are grayed out. Otherwise, these buttons provide access to triggers that allow you to turn the Controller On or Off:
If the Controller is “On” (or the switch is “Not Used”), the output is computed according to the specified method. If the Controller is “Off”, the output is set to zero.
This allows you to deactivate the Controller under specific circumstances (e.g., if you don’t want to Controller to operate when certain conditions are met, or if the Controller cannot operate due to a failure of some kind).
An example model which illustrates the basic use of the On/Off switches for a Controller (ControllerOnOff.gsm) can be found in the General Examples/Controllers folder in your GoldSim directory (accessed by selecting File | Open Example... from the main menu).
Learn more
- Basic Controller Inputs
- Browser View of a Controller
- Comparing the Different Methods: Which Type of Controller Should I Use?
- Constraints on the Output of Controllers
- Controlling a Process Using Multiple Controllers
- Defining a Deadband Controller
- Defining a Proportional Controller
- Defining a Proportional Integral Derivative (PID) Controller
- Defining a Target that Represents an Upper or Lower Limit
- Turning a Controller On and Off
- Understanding Controllers
- Using a Proxy for the Process Variable When Defining a Controller
- Using Controller Elements