toolkit for feedback system? Motion; PID; Control/Simulation???

[Garry S]

Hi, I have to develop/program an organ bath system - a feedback system mimicking real sinusoidal breathing oscillations (shown in attached images). I have NI Labview 8.5, NI-Motion 7.6, a linear motor (M-235 DC-Mike actuator), an MID-7654 Servo Power Motor Drive and a pressure transducer. I believe I will need to control the PID controller and am aware of the PID Control Toolkit as well as the Control Design and Simulation Toolkit for NI Labview. However, is it possible to control the system using the NI-Motion software I have at the moment? If not, do I have to purchase both the PID and Control/Simulation Toolkit or just one? Thanks in advance...

[Nate.H]

Dear Garry,

Do you have a motion controller to interface the MID-7654 to your computer and LabVIEW? This would be the PCI-734x or PCI-735x. If you do, I believe that you could implement your application with LabVIEW and NI-Motion. You could do so by using the analog feedback feature for the control loops for each axis. Then, you could specify the optimal sinusoidal moves/pressure patterns that mimic real breathing patterns. The analog feedback from your pressure transducer will be used during the move(s) to maintain the pressure that you want.

Please see Chapter 13 here for more details:
NI-Motion User Manual
http://www.ni.com/pdf/manuals/371242c.pdf

Here is also a good discussion forum post on Analog feedback:
Can i use NI-7358 to implement a hybrid position force/torque control system?
http://forums.ni.com/ni/board/message?board.id=240&thread.id=2976&view=by_date_ascending&page=1

I believe that the above option would work for you, and you would not have to use the Control Design and Simulation Module or the PID Toolkit. Please let me know if you have any additional questions. I haven't actually set up a system with analog feedback from a pressure transducer before, but I believe that the above would be a very viable option.

Best Regards,

~Nate

[Garry S]

hi, thanks alot for you reply...yes i have a PCI-7340 controller and at the moment am unsure as to how i should approach this program even at the basic level; do you think using the PID toolkit or the Control module would be easier/faster compared to NI motion alone? thanks

[Jochen]

Garry,

a NI-Motion control board runs the PID control onboard. Thus you don't have to care about the control algorithm in LabVIEW, which makes things much easier. Still you will have to tune your system, but MAX provides good tools to do this.

Kind regards,

Jochen Klier
National Instruments