Simulation

Now we are ready to simulate our circuit. Choose Simulate -> Simulation Mode. The display will change; the ladder diagram will appear mostly greyed, but you won't see anything changing with time. That is because the PLC is not yet cycling. To start it cycling, choose Simulate -> Start Real-Time Simulation. Now you will see things happening: the oscillator is obviously running, but the LED (`Yled') is still off, which is what we want, because no one has pressed the button yet. To simulate pressing the button, double-click the text `Xbutton' in the list at the bottom of the screen. You have now simulated bringing the pushbutton input high; this is what would happen if someone depressed (but did not yet release) the pushbutton.