Omron CX-PROGRAMMER V8.1 Operation Manual page 152

Procedures
• Internal variables can be added, internal variable comments can be
changed, and internal variables can be deleted from the variable table in
the function block definition. To add an internal variable, however, memory
must be reserved in advance. Refer to Editing Reserved Memory to Add
an Internal Variable with Online Editing on page 121 for details.
• The previous status flags for all differentiated instructions (DIFU(013), @
instructions, DIFD(014), and % instructions) will be initialized (i.e., turned
OFF) when online editing is finished.
• After performing online editing, do not turn OFF the power supply to the
PLC until the CPU Unit has finished backing up data to the built-in flash
memory (i.e., until the BKUP indicator stops flashing). If the power supply
is turned OFF before the data is backed up, the data will not be backed up
and the program will return to the status it had before online editing was
performed.
Section 3-2
127