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

Chapter 2 About Your Controller
10
RMC Memory
Run Mode Change (RMC) memory is used to store both the logic and user
variable changes made during RMC. The default amount of memory allocated is
2KB and can be increased up to 8KB. However there is still a limit of 2KB for
logic and user variables changes per Test Logic. To adjust the amount of RMC
memory, the controller must be offline. After you have adjusted the amount, you
must build the project and download it to the controller.
In a Connected Components Workbench Release 8 project, the available
IMPORTANT
user data space was reduced by 6 KB to support optimal project settings
for the new RMC feature.
If you have a project that was developed before Release 8, you may need
to reduce the default "Allocated" 8 KB Temporary Variables section from
the Memory page in order to compile the project successfully.
Controller Memory Diagnostics Page in Connected Components Workbench
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
Controller Memory
(for User Program + Data)
Free memory
Used memory
RMC Memory
(Default size = 2KB)
1st change and 2nd change and
Test Logic Test Logic
(Add logic) (Remove logic)
Free RMC memory Used RMC memory
Rockwell Automation Publication 2080-UM005E-EN-E - March 2018
3rd change and
Test Logic
(Add logic)