how to create 24 V digital output pulses with

[nadir]

Hi,

I am trying to generate digital pulses of 24V with the digital I/O 9472 module to control (open/close) 4 valves.

So far i used the example VI Gen dig pulse to test a single pulse.

I have a 24 power supply for the module but the digital pulses generated are about 3V.

Does anybody know how to set the output voltage?

Can i generate 24 V pulses on 4 of the 8 terminals?

Thanks for your help

francois

[Quantumbyte]

Francois,

Do you have any load connected to the 4 channels? or do you simply have the relay? You may be exceeding the current limitations of your power supply, which you can prevent by using a power resistor in line with your relay. Besides, the 9472 provides overcurrent protection, which automatically disables the channel. You can read more about that feature in the 9472 manual located at:

http://www.ni.com/pdf/manuals/373509d.pdf

Let us know if this doesn't solve the issue.

Daniel D.

[nadir]

Hi Daniel,

Thanks for your comment. I have no load connected to the relay.

So far i only generated a pulse with the example VI and measured it with a multimeter on the default output terminal of the 9472. I measured 3V pulses. My power supply is 24V DC i checked that. I have been using the module in slot 5 of the 9172 box in order to use the counter function for pulse generation. Ultimately i want to generate a finite train of pulses on 4 of the 8 terminals to drive my 4 valves.

I read about using a resistor in line on the message board (http://digital.ni.com/public.nsf/allkb/C9019BC9F6544005862572BF0059B532?OpenDocument)

Not sure if this applies for my case.

Cheers

Francois

[K_Bull]

Hey Francois,
First things first, can you confirm that you are able to output 24V from your 9472 by using the test panel in MAX (Measurement and Automation eXplorer). Once you can varify that the output is 24V, then you can move on to using a VI to generate pulses.
Regards,