Build a closed-loop model of a cascaded feedback loop system, and get a list of analysis point locations in the model.

Create a model of the following cascaded feedback loop. $$C_1$$ and $$C_2$$ are tunable controllers. $$A{P}_1$$ and $$A{P}_2$$ are points of interest for analysis, which you mark with AnalysisPoint blocks.

G1 = tf(10,[1 10]);
G2 = tf([1 2],[1 0.2 10]);
C1 = tunablePID('C','pi');
C2 = tunableGain('G',1);
AP1 = AnalysisPoint('AP1');
AP2 = AnalysisPoint('AP2');
T = feedback(G1*feedback(G2*C2,AP2)*C1,AP1);

T is a genss model whose Control Design Blocks include the tunable controllers and the switches AP1 and AP2.

Get a list of the loop-opening sites in T.

points = getPoints(T)

points = 2x1 cell
    {'AP1'}
    {'AP2'}

getPoints returns a cell array listing loop-opening sites in the model.

For more complicated closed-loop models, you can use getPoints to keep track of a larger number of analysis points.