How to click tune button in PID block through script

How to click tune button in PID block through script. I've looked for all available attributes of PID block through get(gcbh) command. But didn't get any help.

Answer 1

[Arkadiy Turevskiy]

Just answered a similar question, please look at the bottom of this answer .

[Chaitanya Kulkarni]

Thanks for your response, but in my case PIDtune & PIdautotuning tool o/p are not matching. i read your answer of sys=-sys & using pidf, but i've PI only. & there is no option of 'pif' as such. so what can be done?

[Arkadiy Turevskiy]

For PI controller simply use pi instead of pidf in the argument.Not sure what you mean o/p is not matching. If you want help, you need to invest some time in explaining the issue precisely.