best daqmx measurement type for multiple closed loop control system

[taov]

Hi,

I wonder what kind of daqmx measurement type that suit for closed loop control system with about 128 control loop?

I have design single closed loop system with continuous sample and on demand sample. Both response good. But I don't know if the control loop number is increasing.

Another question is, is clock time synchronization necessary for this kind of system?

[chaka1234]

taov,

What do you mean about 128 control loop? Could you explain a little bit more about your app?

[taov]

Hi Carmen,

Thanks for your reply. Sorry, I made a mistake on my last explanation. That's not measurement type, but acquisition mode. Below is the detail of my project:

I'm developing a control system for fatigue tester with 100 more sensor (load cell) and actuator (servo valve to drive cylinder). Each actuator has its own PID controller. That mean I need about 100 more PID controller. It is OK since PID vi able to handle multiple input in single loop. I used several PXI controller. The thing that bothering me is :

1. Should I use RTOS for this system?
2. What acquisition mode is the best for this kind of system? Continuous sampling or On Demand Sampling?
3. Should I synchronize timing for each PXI chassis?

[chaka1234 · Accepted solution]

taov,

I would recommend you to use Continuous Sampling since it's hardware time while On Demand Sampling is software time.

As for the RTOS system, please refer to this link.

CarmenC 

[taov]

Hi CarmenC,

Thanks for the link. That answer all my question.

[chaka1234]

taov,

You're welcome!