In Veristand you can add a alarm with one low and one high limit. Often it is helpfully not only have alarm limits but also warning limits. In some automation systems (e.g. Morphe from D2T) we can define three limits.
For example:
Warning: The oil pressure of a engine fall below the warning limit we could log that, show a dialog and stop smoothly the engine.
Alarm: But if we fall below the alarm limit its very important to stop as fast as possible.
