12 Rockwell Automation Publication 2080-UM002G-EN-E - March 2015
Chapter 2 About Your Controller
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 download (while the controller is
disconnected).
RMC Memory Usage When Performing Full 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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