How can a make or set the Y-axis of a processanalyst pen dynamically, based on an argument when I call the cicode function to be implemented

I made a normal trend using this code displaying the average measurement value and scaling the Y-axis automatically to predefined values (arguments).

I call the function from a button and in the input property of the button - up action - up-command like: loadZoomTrend_loc_for("TR_201_FluxHoogte", S201_fh_Min, S201_fh_Max);

FUNCTION
loadZoomTrend_loc_for (STRING strTrenTagF, REAL intSchaal0F, REAL intSchaal100F)

// Avg waarde
	TrnSetPen(31, 1, strTrenTagF);
	SleepMS(20);

//Y-axis scale automatic	
	REAL Range = intSchaal100F - intSchaal0F;
	REAL Avg = (intSchaal100F + intSchaal0F)/2;
	REAL ScaleMax = Avg + Range*2;
	REAL ScaleMin = Avg - Range*2;
	SleepMS(20);
	
	TrnSetScale(31, -1, 0, ScaleMin);
	SleepMS(20);
	TrnSetScale(31, -1, 100, ScaleMax);
	SleepMS(20);

//X-as span
	TrnSetSpan(31,3600); //28800 = 8 uur / 21600 = 6 uur / 14400 = 4 uur / 7200 = 2 uur / 3600 = 1 uur
	SleepMS(20);
END

This works great but I have some limitations regarding this trending output.

Now I want to do the same in process analyst using also cicode function.
How do I do that?

Thanks for your support.