Users may not be familiar with a new temperature environment. In this case, its advisable to use the PID auto-tuning functionality to improve the PID parameters settings. To do so, selecting auto-tuning (S3+4 = K3) for an initial adjustment is suggested. After initial tuning is completed, the instruction will auto modify control mode to the mode exclusively for adjusted temperature (S3+4 = K4). In this example, the control environment is a heating oven. See the example program below:
Results of initial auto-tuning:
Results of using adjusted parameters generated by initial auto-tuning function:
From the figure above, we can see that the temperature control after auto-tuning is working fine and it spent only approximately 20 minutes for the control. Next, we modify the target temperature from 80°C to 100°C and obtain the result below:
From the result above, we can see that when the parameter is 100°C, temperature control works fine and costs only 20 minutes same as that in 80°C.
If you want to test it right away, here is the PLC program ready to download:
PID Autotining PLC program example
We hope this tool is useful for all of you and make your work better. Enjoy it !