How to measure digital output of linear actuator on USB 6009?

[ahsan2]

Hi,

I am a new Labview user and need help with measuring a digital input signal.

I have a Bimba Original Line Electric actuator with an integrated DC motor with encoder, drive, and controller. The drive has a programmable digital output which I have set as a tachometer output that emits 100 square wave pulses per revolution of the motor. I have set the motor to make a total of 56 rev over 22 sec. I want to measure the real-time motor rpm on labview and synchronize it with a few other analog input signals. I wired the actuator to the USB-6009 as shown below.

I opened the USB-6009 Digital I/O test panel and set all the port 0 lines as inputs. However, when I click start and run the actuator, the p0.0 led doesn't blink, as shown below.

Shouldn't the led blink in response to the motor revolutions?

I essentially want to collect the pulse signals from the drive and convert them to rpm on labview.

[crossrulz]

If you are looking to measure the speed, you should be using the Counter.  If you want to look at the pulses with your analog data, I would wire up that digital output to an analog input and add it to your analog input task.

[ahsan2]

I rewired the positive drive output from P0.0 to PFI 0 as shown below.

Then I ran the counter I/O test panel while running the actuator, but the counter remains at zero. The screenshot is below.

Did I wire it correctly?

[crossrulz · Accepted solution]

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@ahsan2 wrote:

Did I wire it correctly?

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It would help if you did not tie the signal HIGH.  Remove the +5V from the circuit.