Rockwell Automation 1763 MicroLogix 1100 Programmable Controllers User Manual - Manual (Page 154)

Publication 1763-UM001D-EN-P - March 2011
152 Online Editing
This problem happens only in out-of-box state or after clear processor
memory.
In online edit during PROGRAM mode (program online edit), there are no
restrictions. For example, a user can insert MSG instruction if related MG file
or MG/RI file is already defined in data file.
ATTENTION
PTO and PWM instructions may not be deleted
during runtime online edit. This is because if the
PTO or PWM instructions were deleted during
runtime online edit, outputs could stop in an
unpredictable state, causing unexpected equipment
operation.
If you attempt to insert or modify a rung with MSG,
PTO, and PWM instruction, the following error
message will be generated by programming software
"Error: Online editing of PTO, PWM and MSG are not
allowed on ML1100 RUN mode." And, the rung with
MSG, PTO, and PWM instruction will not be
accepted.