Please suggest code to find the time period of the process as shown in image.
or any example from which i can have idea.
These types of requests are typically fielded at forums.ni.com. See attached for some tools. I've used the following approach to measure the time between 2 triggers. Drag the following snippet PNG onto a blank LabVIEW diagram to convert to code:
You're looking at a "bump test". Read the tutorials on www.controlguru.com for a good start. You can conduct this test with a simple LabVIEW loop that acquires all the variables (SP, PV, MV) with your choice of I/O driver (NI-RIO, NI-DAQmx, etc.) and plots them against one another.
Those aren't triggers. They're PID control variables. The blue line is the measured output of the plant (PV) and the red line is the input signal to the plant (or another signal that maps linearly to it, MV).
There seems to be confusion about whether the OP is looking for instructions for conducting a bump test or how to analyze that step response and present in indicators. MMS79 - echo back with any further questions.
Thanks for the reply,
as Staab_Engineering suggested it is PID control variables of level control loop.
i want to find the model of level control loop with first order system in labVIEW,
for which i require dead time and time constant of process for further calculation.
How can i get the same in seconds in numeric indicator,
please suggest code or example for same.