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Re: can we control the amount of air to control the speed of the cylinder?
The ultimate solution would be to purchase an analog output card for the cRIO. Though I dunno if it would be legal.
Purchase a 9263 4-channel analog output 0-10V output module to control a pneumatic analog regulator.
Next you'll need a 12VDC version of an analog regulator.
Last you'll need an external piloted valve because most KOP valves are internal pilot and won't trip the spool below 30PSI if you want to control PSI down to 1 PSI use an external pilot valve and vary the regulator with an analog 0-10V control signal with a full scale of 60 PSI is equal to 10volts.
You'll have to post some questions to make sure all the above is legal though...
Attached is a spec sheet on something I was checking into.
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