ST comments

Comment	Description	Sample:
Single line	Starts with // and ends at the end of the line.	`// Dies ist ein Kommentar`
Multi-line	Starts with (* and ends with *).	`(* Dies ist ein mehrzeiliger Kommentar *)`
Nested	Starts with (* and ends with ). Additional (.... *) comments can be contained within this comment.	`(* a:=fbTest.out; (* 1.Kommentar ) b:=b+1; ( 2.Kommentar ))`

In addition, one or more marked lines can be commented in/out with a menu command or a shortcut:

Tooltips comments

You can create a tooltip for a POU by inserting a comment above the declaration of the POU.

Sample:

// Das ist ein Beispiel-Funktionsbaustein
FUNCTION_BLOCK FB_Sample
VAR_INPUT
END_VAR