PID Closed Loop with CONTROL_SET2 tunning

[Nickla_DK]

Hi.

I have a closed loop that I am going to make an auto tuning program for.

I want to use the Control_Set2 because it faster to make the tuning with that.

But normally the Tangent-method is used for Open-loop, but can it be implemented in a closed loop as well?
Or it is better using the method in Control_Set1, by continuous oscillation?

Thanks for your help. And for a great lib 

By the way, the documentation for CONTROL_SET2 is not right - variable description i wrong. Both DE and ENG.