In Online mode, the contacts and coils in the Ladder Diagram that are in the "On" state are colored blue. Likewise, all lines over which the "On" is carried are also colored blue. At the inputs and outputs of function blocks, the values of the corresponding variables are indicated.
Breakpoints can only be set on networks; by using stepping, you can jump from network to network.
If you place the mouse pointer briefly above a variable, then the type, the address and the comment about the variable will be displayed in a Tooltip.