To enter the ASCII editor mode for a rung, we double-click on the rung we want to edit, or we can select the rung and select “ASCII Edit Mode” from the Edit menu in the toolbar. we can also click on a rung and select the key combination CTRL+A.
In ASCII edit mode, the rung is displayed as a series of text representations of the logic.
We see that the open contact is represented by XIC, or Examine if Closed, followed by the address assigned to the instruction.
The timer is represented by RTO, or Retentive Timer On-delay, followed by the timer address and then the configuration parameters in the order they appear on the graphical timer instruction.