Troubles with cRIO and NI-9472

[rolandonunez]

I need help! I'm trying to use this servo example http://forums.ni.com/t5/Example-Program-Drafts/Servo-motor-RC-control-using-LabVIEW/ta-p/3535211  but i can't get to connect the DO of the NI-9472 because it says it's not well connected. I've been trying for hours and i still can't find a solution. I'm currently using LV 8.5 and cRIO 9002. I'm trying to control 4 servos for a basic control, nothing complex. I'm also trying to generate a PWM to control the DO but it's the same problem, when i'm going to connect the wires, an X appears.. I hope it's not a problem. Thanks

[GerdW]

Hi rolando,

can you show a screenshot of your project with RT and FPGA part fully expanded?

Is the NI9472 module implemented correctly within the project?

an X appears.. I hope it's not a problem

When there is an X you surely got a problem! 😄

[rolandonunez]

I finally connected it and i now i can run the fpga. The main problem is that nothing happens. I read the comments in the servo link i posted and no one is having any trouble with it but me. I just want to generate a simple PWM signal so I can control the servo using Labview but i can't find the DO give me that signal. I tried using the examples and nothing happen. please help me and i kudo later

[rolandonunez]

I finally connected it and the fpga run. The main probles is that nothing happens. As I said, I'm using the servo example in the link i posted but if you read the comments, no one is having troubles with except for me. I just want to generats a PWM signal to my DO and control a servo using Labview. I've tried with the examples and nothing happens. Please help me and I kudo

[rolandonunez]

Hey guys! I want to control a servo using a pwm signal so my question is, Can I program a pwm signal to change every 2 seconds to control the servo and get it in the position i want? Can I type each position I want and then repeat them in an automatic mode? If I can, How can I do that? This is for my final project and I'm having some troubles. I'm using a NI-9472, Labview 8.5, cRIO 9002 and FPGA module. Please help Thanks

[GerdW]

Hi rolando,

did you read the manual of your module?

Did you attach all needed wires according to page 12&14?

Did you check the outputs with a multimeter instead of attaching directly to a servo motor?

Edit:

Please don't start double threads on the very same topic!

(I merged your new thread into this one…)

[rolandonunez]

Hey guys! I want to control a servo using a pwm signal so my question is, Can I program a pwm signal to change every 2 seconds to control the servo and get it in the position i want? Can I type each position I want and then repeat them in an automatic mode? If I can, How can I do that? This is for my final project and I'm having some troubles. I'm using a NI-9472, Labview 8.5, cRIO 9002 and FPGA module. Please help Thanks

[Bob_Schor]

Please help us to help you.  Attach your VI (the actual VI file, not a picture of its Block Diagram) that is giving your trouble (or, if there are a lot of VIs in your Project, compress the folder that holds your Project and attach the resulting .zip file).

Bob Schor

[GerdW]

Hi rolando,

I told you before to stay with your thread and not to start double threads on the very same problem!

So why do you keep on starting new threads? (Again I merged your threads…)

Please answer my questions asked two days ago!

[rolandonunez]

I solved it thanks! I haven't replied because I was really busy, sorry. I'm working with pwm signals as I said and I can perfectly control my servo but I have some questions that I hope you can help me with. Can I type each position I want and then repeat them in an automatic mode? If I can, How can I do that? I'm working with the loop timer in usec so when the "low period" is 19000 and the "high period" is 1000 the servo move to one side, when the "low period" is 18000 and the "high period" is 2000 the servo move to the other side. Let's say I want to save these two "positions" and then hit the play button and they start changing in an automatic way. Thanks

I'm using a NI-9472, Labview 8.5, cRIO 9002 and FPGA module