The line numbers of the text editor give the number of each text line of an implementation of a POU.
In Off-line mode, a simple click on a special line number will mark the entire text line.
In Online mode, the background color of the line number indicates the breakpoint status of every line. The standard settings for the colors are
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dark gray: This line is a possible position for a breakpoint.
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light blue: a breakpoint has been set in this line.
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red: The program has reached this point.
In Online mode, simply clicking the mouse will change the breakpoint status of this line.