trigger on plateau

[lez]

I have a waveform input which looks like a square wave only that its rising and falling edges are not perfectly sharp. Anyway now I'd like to let the system send out a high voltage (we're gonna use it as a trigger) when the amplitude of the waveform is at high level and low voltage when it's low. Is there any VI's that can implement this? Thank you if you can give me any suggestions.

[BFeigum]

There are several different ways to accomplish this, but try the Derivative function. When you are at a plateau, your derivative will be zero. You can then trigger your signal with a comparison. If you can send a sample of the waveform, we could probably help you further.