You can control a switchable component by using a switch parameter. In the switch parameter location add a parameter (or calculation) which returns a 0 for "off" and any other value for "on".
The simplest switch parameter would be something like $a=range(0,1) which will switch on or off 50% of the time but you can be far more imaginative if you like! For example, you could use $a=range(0,3) which will be on 75% of the time.
Switch parameters allow you to create electrical component diagrams that can dynamically switch switches and turn on globes.
The parameters we have used are below.
