Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 171

Also, programs can be written in the RUN status from a programming tool connected to another station on the
network.
Programming tool
(1) Memory for online change
A program cache memory (program memory) is available.
(2) Number of steps that can be batch-written by online change
Up to 512 steps can be batch-written.
(3) Changing the reserved area for online change
A program file has an area designated as reserved area for online change to support the online
change that changes program file size.
The following provides precautions when the size of reserved area for online change is changed.
(a) Size of a program file
The size of a program file is addition of created program size and reserved area for online change.
(b) When program file size is increased from the secured capacity
If the size secured for the program file (size including reserved area for online change) is exceeded after a
program is written in the RUN status, the reserved area for online change can be reset before the writing if the
user memory area has space.
(c) Increase in the scan time
The scan time is increased when reserved area for online change is reset when programs are written in the
RUN status.
For increase in the scan time, refer to Page 486, Appendix 3.3 (7).
MELSECNET/H
PLC-to-PLC network
Change a program with programming tool and
write it to the CPU module in the RUN status.
CHAPTER 3 FUNCTIONS
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