Undo and redo simulation changes

You can undo and redo certain actions taken on the Canvas, in the Simulation Manager and Properties Inspector, such as adding a Model to or deleting a Model from the Canvas. You can also undo or redo changes made from the View/Edit menu that are saved with the simulation, such as changing the color of icons and streams. When you hover over Undo or Redo, you will see a list of up to five a changes that you can undo or redo in the form of tool-tips.

More specifically, you can undo/redo the following:

• Changing the specification status for variables

• Setting variable and parameter values

• Setting variable and parameter units of measure (UOM)

• Adding or deleting models

• Adding or deleting variables, parameters, and equations

• Adding or deleting connections

• Adding or deleting Variable References

• Transitioning between Simulation Modes

• Moving the location of a model on the Canvas

  Notes: When running a simulation in Dynamics mode, you cannot undo or redo an action. You can only undo or redo an action in Dynamics Mode when the simulation is paused or stopped. If you make a change to a Library Model Type, the redo "stack" is cleared.

  Button	Purpose
  Undo	Undo a change to a simulation. You can also press CTRL+Z to undo an action.
  Redo	Redo an action that has been undone from the Process, Fluid Flow, or Dynamics tabs. You can also press CTRL+Y to redo an action.

Example: Undoing a specification value change

1. Import the U2 - Steam Turbine example simulation from the %userprofile%\My Simulations\Examples folder. At this stage, Undo and Redo are not available because no changes have been made yet.

2. Double-click Feed1 in the Simulation Manager and note that the W, P, and T variables are specified.

3. Observe that W is specified as 30 kg/s. Now change the value of W to 40 and observe that F and Q are calculated.

4. Select Undo in the application ribbon.

5. Observe that W is once again 30 kg/s and F and Q are recalculated.