Allen-Bradley 2080-LC20-20QBB User Manual page 21

Rockwell Automation Publication 2080-UM005E-EN-E - March 2018
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
Controller Memory
(for User Program + Data)
Free memory
New used memory
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.
Insufficient Controller Memory Example
Controller Memory
(for User Program + Data)
Used memory
About Your Controller
RMC Memory
(Default size = 2KB)
Used RMC memory is copied
to controller memory
RMC Memory
(Default size = 2KB)
Error will occur due to insufficient
controller memory remaining
Chapter 2
Free RMC memory
Free RMC memory
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