Generating 8KHz Square on NI 9401

[Duffy2007]

Hello AllanIL,

please verify the 5V signal, because the driver need a sink not a source modul normally the modul can both.

[AllanIL]

Hello Duffy,

Can you elaborate a bit more on this as I am not that great with electronics. I am supplying the 5V signal as a DO to the stepper driver via DO1 which is as it is hooked up right now. I just hooked the driver up as they indicated on their drawing. Is there a difference if so how would I fix this?

Would I simply inverse the ground and the power lines within my connections?

http://www.linengineering.com/wp-content/uploads/downloads/R701-R710/documentation/Connection_Schema...

[Duffy2007]

Hello AllanIL,

you use the modul like on page 16 the LED connection is shown.

http://www.ni.com/pdf/manuals/374068g.pdf

Now it was good if we see how the signal looks on the line, a scope or analog Input can be used to monitor the DO signal to see where the behaviour happend.

[AllanIL]

Hmmm... My current connections seem to be the same as the LED as I have my nibbles set for the outputs but inversed. 0:3 is my output and 4:7 is my input would this matter? I have my power out to the 5V and as well to the STEP of the driver.

[Duffy2007]

Hello AllanIL,

yes you can use 0:3 as output, this should not make the behaviour we see. Interesting is how the signal looks like.

[AllanIL]

Duffy,

It appears that the issue was with the ramping of the motor itself. There wasn't enough momentum to get the motor spinning at the rpm needed. Do you know of a good way of constantly ramping up the velocity using DAQMX commands until a set frequency?

[Duffy2007]

Hello AllanIL,

not tested.

Best regards.