Software PID loops

[MogaRaghu]

>>Do you want the user to dynamically change the Process Variable?

In the simulation mode , yes!

In the real time process the PV will change in response to the output or atleast thats what is expected to happen.

[jpaul]

Raghunathan,

It appeared that your original question related to an initial spike you saw when the set point was 5 and the process variable was 0. What this in your manual mode (which would spike to saturation without excitation) or when you tried to use it as a closed loop control system?

It might help at this point if you re-state your question just to ensure that we are on the same plane.

Thanks for your patience!

Cheers,

Jonah
Applications Engineer
National Instruments

[MogaRaghu]

Dear Jonah,

The spike was in simulation mode. I am now actually trying out the PID loop in an actual process and the loop seems to do the job. The process of fine tuning is under way and will revert.