Multiple Analog Triggers

[markp01]

I need to monitor various voltages for over-voltage condition, with an (immediate) hardware output for disabling external equipment.
I know I can set up an Analog Output Trigger on an Analog Input and use this, but can I set up different trigger levels on various channels ?
Effectively use the DAQ AI channels as programmable comparators...

[Spencer S.]

Greetings,

Unfortunately, an analog input trigger can only be configured for one channel at any given time. You may want to consider using DAQ Occurrences. Below, I have included a link to a document that provides an overview of DAQ Occurrences:

An Overview of DAQ Events and Occurrences

You would, most likely, want to use DAQ Occurrence 3. Below, I have included a link to an example program demonstrating how to use this particular occurrence:

Analog Trigger Event Messaging in LabVIEW (DAQ Occur
rence 3)

Finally, I have attached a quick example that uses DAQ Occurrence 3 to monitor two channels. Using this programming structure, you should be able to monitor as many analog input channels as you want.

Good luck with your application.

Spencer S.

[RayFarmer]

Thank-you Spencer S.

I have previously looked at this option, and as long as the time between the "Occurrence" happening and the software responding to it (such as setting a DO) is small it would work OK (small being <100uS).

I had looked at using the GOEPEL PXI 3240 Comparator to do the signal monitoring, but I am very keen to put the DAQ parts of my application on an RT PXI module. If your solution works I can do it !

I would presume that linking a DO to an Analog Input occurrence on an RT module is fast, Is there any way to quantify it - assuming the "Occurrence" thread has highest priority ?

[RayFarmer]

Do not understand how "Ray Farmer" posted my reply ! It is from Clive really...