VI for current (mA) analog out (cdaq)

[GBEN]

I'm having trouble making a VI work with a 9265 analog out (current) module

VI: (see attached)

1. DAQmx create channel AO-current-basic outside while loop

2. inside the while loop DAQmx write analog double 1 channel 1 sample

3.control wired to the data input that ranges from .004 to .020

I set up the task for analog output current for the module in measurement and automation explorer.

Thanks!

[GerdW]

Hi GBEN,

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@GBEN wrote:

I'm having trouble making a VI work with a 9265 analog out (current) module

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Which trouble do you have?

[GBEN]

I don't think I am getting any current output from the module.

I also posted on the multifunction daq forum verifying that I have the wiring correct to the module, but I wanted to check on if I made a mistake on the VI as well.

Thanks for your help.

[GBEN]

Gerd does the way I used that write to analog output look OK to you?

Is feeding .004 to .020 as a double to the data input correct if I want the module to ouput 4-20mA? 

[santo_13]

Electrical connecting is equally important as how you implement the software.

Please share the exact circuit of how you connected stuff and share the VI in LV2016 version so that you can cover a larger audience.

[GBEN]

wiring:

1. +24 V from power supply to Vsup on module

2. ground from power supply to COM on module

3. wire 1 from valve to AO1

4. wire 2 from valve to AO2

[JensG69]

What does the documentation of your valve tell about wire 1 and wire 2?

Regards, Jens

[GBEN]

input: 4-20 mA

impedance: 260 Ohms

black is positive, white is negative

[santo_13]

Since it is a current loop, the sensor/valve is always in series with the supply and measuring/generating device.

You should be connecting the valve positive to the AO of the instrument and negative to GND and not between 2 AOs

[GBEN]

Thanks for the reply.

On the 9265 module, the terminals are labeled AO0 and COM0 and I understand the datasheet as indicating that the device should be wired to these terminals, and the power supply should be wired to the Vsup and the Power Supply COM. You are saying to wire

Positive from valve (black) to AO0,

negative from valve (white) to negative of power supply,

Positive from power suppply to Vsup

negative from power supply to Power Supply Common

Correct?