What function do Dir (CCW)/Step (CW) have ?

[water2006]

I use the NI 7334, I would like to control the Dir (CCW) and Step (CW) pin. I don't know the mean of Dir and Step word.

Can it use the other works apart from CW/CCW function ?

Thank you very much for your help.

[Jochen]

The NI 7334 support two different control modes for stepper motors. Step and Direction mode and CW/CCW mode.
I think these graphics should explain the functionality quite well:

  

It depends on the drive type which mode you should choose. Most drives work with step and direction signals. You can configure each axis for one of the two modes in MAX.

I hope this helps,

Jochen Klier
National Instruments Germany

Message Edited by Jochen on 11-08-2006 05:52 PM

[water2006]

I would like to create the code to control the Dir and Step mode, please help me.

Thank you very much for your help.

[Jochen]

The easiest way to configure the stepper mode is using MAX:



If you need to set the stepper mode in your program you can do this with "Configure Stepper Output.flx" (LabVIEW) or "flex_configure_stepper_output()" (C).

After that you don't have to take care of the step generation anymore. You simply command the board to move the axis to a certain target position and set the acceleration and deceleration values. Please refer to the shipping examples.

Best regards,

Jochen

Message Edited by Jochen on 11-09-2006 09:32 AM

[water2006]

Thank you very much.

I have a problem, I must initial the asix every time by Measurement & Automation program before runing my control program, please help me to sample the initial code to me.

Thank you very much for your help.

[Jochen]

You should use Initialize Controller.flx (LabVIEW) or flex_initialize_controller() (C) in your program to download the MAX settings to the controller at startup.

[water2006]

Thank you very much for your help.