In the "configure axis resouces.flx" fuction,I can set the primary output,primary feedback, secondary output, secondary feedback.
If I want to use the closed loop control, I set the primary output "DAC1" to actuate the system, and primary feedback "ADC1" to complete the the closed loop system,is it right
Sorry but I don't understand this question. What's the purpose of the error signal. Which device should send it? Which device should receive it? What's the connection to the feedback and control signals? Are you looking for a bidirectional digital signal?
"...now,I have an input signal that is "primary output=DAC1" to actuate the system ,and an output signal that is "primary feedback=ADC1" "
Is this a statement from the drive's point of view?
I want to use 7344 card to complete closed loop PID control to actuate the piezoactuator I have a problem how to connect the wire to complete the closed loop control
Is your error signal the difference between setpoint and feedback signal? In the terms of motion control this is called following error and you can read this value with read following error.flx in LabVIEW or with flex_read_follow_err_rtn() in text based programming environments. While moving the setup is generated dynamically by the trajectory generator on the board.
I have a little ideal about how the closed loop PID control work. In "picture",there are some concept, is that right? thank you
and I find a example code at
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DCAD56A4E034080020E74861&p_node=DZ52469&p_source=external (Automatic Analog Feedback with FlexMotion) and http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E82356A4E034080020E74861&p_node=DZ52469&p_source=external (Manual Analog Feedback with FlexMotion)
If you are trying to achieve Motion with Analog feedback, these examples should be what you are looking for. The diagrams that you have attached are not exactly the way I am accustomed to seeing the system described, but are close to what's going on.
If you are trying to figure out what items to wire up, the analog input to the motion system will be the feedback from your piezoactuator, and the analog output of the motion system will be the input to your actuator.