Mitsubishi Electric MELSEC iQ-R-R04CPU - Page 119

5 WRITING DATA TO THE CPU MODULE
5.2 Online Change
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Reserved area for online change
Reserved area for online change can be set in a program file to address the online change (ladder block) which causes a
change in the program file size. ( GX Works3 Operating Manual)
In addition, if the changed program exceeds the program file capacity (including reserved area for online change) during the
online change (ladder block), the reserved area for online change can be set again if there is space available in the program
memory.
Required free space in the data memory
If the data memory does not have enough free space when the online change (ladder block) is executed, an error occurs. The
free space of the data memory required for the execution of the online change (ladder block) depends on the size of program
files to be changed or the usage of labels.
*1 When the setting of [Convert]  Online Program Change]  [Write Program Restore Information] is "Write with Execution Program", the
required free space is equal to the size of the program restoration information.
The size of the program restoration information can be checked from the memory capacity calculation of the engineering tool.
[Tool]  [Confirm Memory Size (Offline)]
Ex.
The following table lists required free space of the data memory (size of program restoration information) for the online
change (ladder block) in the R120CPU with a firmware version "30" or earlier.
Online change (ladder block) during the boot operation
When the online change (ladder block) is performed while booting from the SD memory card, the corresponding files on the
booting SD memory card can also be changed.
CPU module Firmware version Required data memory space
R00CPU, R01CPU, R02CPU All firmware versions Total increased size of the relevant program
restoration information
*1
R04CPU, R08CPU, R16CPU, R32CPU, R120CPU
R04ENCPU, R08ENCPU, R16ENCPU, R32ENCPU, R120ENCPU
"31" or later
"30" or earlier Size of the program restoration information
Process CPU "13" or later Total increased size of the relevant program
restoration information
*1
"12" or earlier Size of the program restoration information
SIL2 Process CPU All firmware versions
Safety CPU Standard program "13" or later Total increased size of the relevant program
restoration information
*1
"12" or earlier Size of the program restoration information
Safety program All firmware versions
Target program of online change (ladder
block)
Required free space in the data memory
When labels are not used When labels are used
(200 global labels and 200 local labels
are used)
Ladder program of 1K steps Approx. 20K bytes Approx. 40K bytes
Ladder program of 10K steps Approx. 80K bytes Approx. 140K bytes
Ladder program of 100K steps Approx. 550K bytes Approx. 1000K bytes