A rung is inserted one down from the rung you selected. To insert, select a rung when the online monitor is on, and click [Insert Rung (R)] under the [Logic (L)] menu.
To delete a rung, select the rung to be deleted and on the [Edit (E)] menu, click [Delete (D)].
Upon deleting a rung, the [Transfer Logic] dialog box is displayed and the modified logic program will be transferred to the display unit. You do not need to go to the [Logic (L)] menu and click [OK (O)].
Alternatively, you can insert/delete rungs by right-clicking the rung.