Labview timing vi

[Malueg]

I am trying to write a lab view timing vi I have model 9422. I am using a pressure switch for a digital input signal to a daq assistant input.  I need to have a timed control output for a bleed off of a valve. The valve needs to bleed off for a certain time period. The input from a pressure switch would be a momentary input.  Any samples?

[Gregory]

You will have a digital input from a pressure switch, which will become TRUE when the valve needs to bleed off? You say it is "momentary", how long will it stay TRUE if you don't do any bleeding?

You have a bleed off valve, is that controlled by a digital output? You want to bleed off for a certain amount of time, is that on the order of milliseconds, seconds, minutes? What should happen if you are already bleeding off, and then the pressure switch input becomes TRUE again?

[Malueg]

My normally open air actuated pressure switch will close at 112psi then return to open when the pressure is below 80 psi. I am continually cycling an air compressor to see the longevity of the compressor. 

[GerdW]

Hi Malueg,

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@Malueg wrote:

My normally open air actuated pressure switch will close at 112psi then return to open when the pressure is below 80 psi.

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So you need a switch with hysteresis (like 96+-16 psi)?

Why did you ask for some timing?

[Malueg]

I need to construct a timed off relay. Input from my air switch will start timer after timer times out it will turn of air valve.