Abbreviation: 
-Symbol out of the toolbar
By this the simulation is stopped and the machine is switched in the edit mode. You can edit and download the PLC-program while the machine is running.
Many first-time-users of TrySim have to get used to the existing of two start- and stop-buttons. With the buttons in the toolbar or by the menu you can start and stop the simulation. With the buttons which you create yourself the simulated machine can be stopped and started.
The simulation will also be stopped and switched to the edit mode if you add a new element or if you click right anywhere in the white area of the graphic window.
In the single-step mode the PLC-program is executed by this menu point till the end of the current scan and the simulation is stopped then. If during the execution of the program another breakpoint is found this one will be ignored.