Expression Variables

When entering expressions for virtual measurements, variables are used to represent the output of a individual sensors and other measurements.

Adding a Variable

Follow these steps to add a variable:

1. Click the Parameter link. The Parameter Selector window appears.

2. Double-click on the PID or sensor that you wish to use for the variable.

3. In the Unit dropdown of the Variable Wizard window, select the unit you want to use for this variable.

4. If you want to use a special function (modifier) for the variable, select the desired function and then enter the associated Period in milliseconds.

5. Click Ok.

Note

• If you know, the internal name of the measurement you want to add, you can type it directly into the Math Expression box as text.