Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 421)

Online Editing and Monitoring
18-11
Accepting a Rung
Edits are sent to the processor when you accept a rung. Once you accept the rung, the
data values are applied.
!
On accepting a rung, the scan time and interrupt latency may increase up to 10 ms
per scan. Note that although data table values have changed permanently, the rung
changes are not permanent. You must test and then assemble your edits to make
your edits permanent. Canceling edits does not restore previous data table values
that have changed.
Important If your program was downloaded to the processor with the future access (OEM Lock)
bit set (S:1/14), you must upload from the SLC 500 after making online changes. If
not, you will be unable to access that processor online again.