There are two ways to execute a trigger. In the trigger overview, select the trigger and click on “Execute now”. The trigger is then started immediately, regardless of the configured trigger conditions.

Or you can start the trigger via the configured trigger condition. If you use the [MB] simulator, you can open the variable view (PLC => PLC => Variables) and write a 1 in the column for the value of the trigger variable.

If you are using a real PLC, you can write a 1 in the corresponding trigger variable via Tia Portal.