Welcome
I would also like to make a warning signal on PC RT. I am using Win 7 and have already managed to create a script that triggers an alarm but if it is generated in wmplayer and the loop playback function is unchecked, the signal is still generated even if I exit PC RT then I have to open wmplayer manually and stop playing. I believe it may be like that, I just need someone help me how to create a script that will act as an acknowledgment for the triggered alarm and end it immediately. Am I able for the alarm to be triggered again, e.g. after 30 seconds, if in the PLC process there is still a state saying that the value has been exceeded? (I use the variable from Tag Hmi) It will be possible to do it all in PC RT or it will be necessary to interfere with the PLC.
To invoke the script, I used the following syntax:

Regards Simon

Sub Play()

Dim WshShell, mediafile

mediafile = "C:\alarm.mp3"

Set WshShell = CreateObject ("WScript.Shell")

WshShell.Run "wmplayer /play """ & mediafile & """", 0 ,0

Regards Simon

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Split from WinCC Advanced alarm horn.