in the Run Toolbar is pushed to its "down" state. When this command is selected, the Breakpoints window is displayed and the cursor changes shape to
Breakpoints Command (View Menu)
Use this command to display the Breakpoints window, where you can select and/or view the units and loops which are assigned as breakpoints during calculation. When PRO/II executes the simulation, the execution stops when the calculation reaches a breakpoint. This allows you to view the results generated so far and to make changes in the input data.
The breakpoints may be assigned either before or after an unit's or a loop's calculation is performed. Note that if the unit assigned as the breakpoint happens to be a part of a loop, the execution stops at that unit (before and/or after it is solved) during each iteration of the loop.
Usage
This command is available to you only from the "breakpoints" mode when the Set Break Points button in the Run Toolbar is pushed to its "down" state. When this command is selected, the Breakpoints window is displayed and the cursor changes shape to
Setting breakpoints using the Breakpoint Window
In the breakpoints window you can set the breakpoint to be Before and/or After the desired unit or loop by checking the required location option(s). The location can be changed for every breakpoint unit or loop by selecting the option(s) immediately before setting the breakpoint. Changing the location option for a breakpoint does not change the option(s) selected for the previous breakpoints.
To delete a breakpoint, remove the highlight from the desired unit or loop by clicking the mouse. To remove all the breakpoints push the Clear All Breakpoints button.
Setting breakpoints using the cursor
In the "breakpoint" mode, you can set the breakpoints on units in the flowsheet diagram by clicking the mouse button over the desired units. By performing multiple mouse clicks you can set or remove the breakpoint as indicated by the color of the selected icon. As the breakpoints are set or deleted, it is also indicated in the Breakpoints window. However for recycle loops, you can set the breakpoints only through the Breakpoints window.
Note that the location of the breakpoint for the selected units will depend on the current options selected in the Breakpoints window. The Breakpoints window may be closed when you are setting the breakpoints through the flowsheet.
To exit the "breakpoint" mode, simply push back the Set Breakpoints button to its "up" state. To display the breakpoints while executing the simulation, push the Show Breakpoints button to its "down" state.
Additional Information
PRO/II simulates a flowsheet in a "sequential modular" fashion by solving one unit at a time. The order in which the units are traversed is determined by the Calculation Sequence method selected for that simulation. When breakpoints are assigned, the execution stops at these points whenever they are encountered in the calculation sequence. You then have the option to continue execution from the breakpoint by pushing the Start button, or from any point in the sequence using the Goto mechanism.
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