Increase Speed of DAQmx Sequence

Hi Everyone. I'm working on my first Labview program that will use a stepper motor to apply a load which is measured using a loadcell. I'm using a stepper motor driver that takes digital output from my NI USB-6009. I'm struggling with how to improve the rotation speed of the stepper.
An image of my basic program is attached. I've tried to make the labels on the tasks explain what each digital signal is responsible for. I'm hopeful that when I contain the sequence within a while loop the motor rotates quicker than what it does. Does anyone have an suggestions on how I can improve the speed of the program?
One thing I was thinking about was instead of passing an individual F and then T to the driver to create the step I could put both the F and T into a waveform. Unfortunately I haven't had any luck in making that happen with my limited knowledge.
Another thing that I don't fully understand are the options in the DAQmx write function so I suspect I may be able to do something different there.
Any suggestions and help that could be offered would be very much appreciated.
Attachments:
StepperDrive.jpg ‏178 KB

Hi Mark,
Thank you for your reply. I'll try to further explain:
- the MS1-3 are digital signals that control the angle of a single step for the stepper motor. The stepper that I'm using has a single step angle of 1.8 degrees however the driver allows that to be reduced to half, quarter, eighth, or sixteenth. This is set by the specific combination of high and low values from the MS1, MS2, and MS3 pins. For example, if the desire is to have the motor rotate with a step resolution of 0.45 degrees I would assign MS1 = H, MS2 = L, MS3 = H.
- the DIR is a digital signal that controls direction of rotation.
- the STEP pin is a digital signal that first goes to low and then to high. The driver detects the raising edge of the high signal and make the stepper motor rotate by one step using the parameters defined by DIR and MS1, MS2, and MS3.
- If anyone is curious I'm using "Big Easy Driver" to operate the stepper (http://www.schmalzhaus.com/BigEasyDriver/BigEasyDriver_UserManal.pdf)
- I've modified the block diagram (please see attachment) slightly just to give an idea what I'm trying to do. My goal is to just get the stepper to spin as fast as possible so I believe optimizing whatever is in the while loop is what I want to accomplish. Once I feel that I've got the best speed I will remove the while loop and turn the program into a SubVI.
- I'm very new to Labview but I'm guessing that using a waveform that goes from low to high could replace the last two DAQmx write functions with one. I'm struggling with creating the waveform as well as what to select from the write funtion "polymorphic selector".
- Is there a preferred method of the sequence structure? I believe that the DIR and MS1 - 3 pins must be established prior to the STEP signal and using the sequence is how I have tried to control this.
Again, thanks for any help that can be provided.
Attachments:
StepperDrive.jpg ‏194 KB

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