Enter variable comments in the [Edit Symbol Variable] window's [Comment] field. Enter up to 32 characters.

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For how to input the symbol variable comments, refer to the following.
30.3.2.1 Registering Symbol Variables
You can also add and change the symbol variable comments in [Properties].
30.14.5 Using Reference Features to Search Logic Programs
You can display a list of symbol variable comments and edit the comments in the [Comment List] window.
30.7.4 [Comment List] Window
A comment about the system variable can be added or changed using the [Edit Symbol Variable Comment] dialog box, which is displayed by right-clicking the symbol variable section allocated to the instruction and selecting [Edit Symbol Variable Comments (V)].
A comment about the symbol variable is displayed in a tool tip when the cursor is placed over the symbol variable part of the instruction.
Press the [F9] key to display all comments in the logic.
If the entire comment does not fit in the comment area, the rest of the comment is indicated by a "...".
Click the comment to view it in its entirety.
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You cannot edit the symbol variable comment during online monitoring.