24 Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
Chapter 2 About Your Controller
Controller Memory Diagnostics Page in Connected Components Workbench software
During RMC an incremental build is performed and only incremental changes
are downloaded to the controller until the RMC memory has been filled.
RMC Memory Usage Example
If not enough RMC memory is available to make more changes (for example, a
“not enough memory” error message appears during RMC build or Test Logic),
then a full download must be performed to transfer the incremental changes
from the RMC memory to standard user program and data memory.
Transferring Contents in RMC Memory to Controller Memory
The changes that you have made during RMC are stored in RMC memory and
will remain there until you perform a full build and download (while the
controller is disconnected).
RMC Memory Usage When Performing Full Build and Download Example
However if the controller memory does not have enough space remaining to
copy the contents of the RMC memory as shown below, the operation will fail
and a “not enough memory” error message will appear. Do not use RMC if you
are near the limits of your controller memory.
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
Used memory
Free memory
Used RMC memory
Free RMC memory
1st change and Test
Logic
(Add logic)
2nd change and
Test Logic
(Remove logic)
3rd change and
Test Logic
(Add logic)
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
New used memory
Free memory
Free RMC memory
Used RMC memory is copied to
controller memory
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