Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 428)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
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Action Effect of Edit (upon accepting the rung)
Cancel edits Replace and delete rungs change to normal rungs and continue to
execute. Insert rungs are removed from the user program.
Test edits “I” rungs become active; “R” and “D” rungs become inactive.
Untest edits “I” rungs become inactive; “R” and “D” rungs become active.