Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 427)

Online Editing and Monitoring
18-17
Effects of Online Editing on Your Project
This section describes how run mode and program mode online editing affect a user
program. The effect of each type of edit varies depending on the type of rung the cursor
is on.
Run Mode Online Editing Effects
Action Effect of Edit (upon accepting the rung)
Insert a rung A rung is inserted and marked with an insert zone marker.
Delete a rung
Normal rung : Rung is marked for deletion, it continues to execute,
and a “D” appears on the power rail.
Insert rung : The rung is removed from the user program. It was not
executing.
Delete rung : Nothing happens because the rung is already marked
for deletion. A delete rung cannot be removed until edits are
accepted because in runtime mode, a delete rung still executes.
Insert rung of “I/R” pair : The insert rung is removed from the user
program and the replace rung remains but the replace zone marker is
removed.
Replace rung of “I/R” pair : The rung acts just like a replace rung and
remains in the program until edits are accepted because the rung is
executing.
Modify a rung
Normal rung : The original rung is marked with a replace zone marker
and a copy is created above it and marked with an insert zone
marker. You can only modify the insert rung of the “I/R” pair.
Insert rung : The insert rung is modified. An “I/R” pair is created only
until the rung is accepted.
Delete rung : This is not allowed because the rung is executing.
Insert rung of I/R pair : The insert rung is modified. The original rung
is marked with a replace zone marker and a copy is created above it
and marked with an insert zone marker. The original replace rung is
unchanged and continues to execute.
Replace rung : This is not allowed because the rung is executing.
Undelete a rung If a rung exists in the delete buffer, it is placed into the user program
above the current location and is marked with an insert zone marker.
Assemble edits Insert rungs are changed to normal rungs and are executed. Replace
and delete rungs are removed from the user program.