Rockwell Automation Publication 2080-UM002G-EN-E - March 2015 13
About Your Controller Chapter 2
Insufficient Controller Memory Example
Limitations of RMC
Take note of the following limitations when using the Run Mode Change (RMC)
feature:
• Configuration changes cannot be made (for example, change filter times).
• Up to 2KB of logic (approximately 150 boolean instructions) and user
variables and can be added for each Test Logic.
• Total memory allocated for RMC (cumulative of all Test Logic Changes)
can be increased from 2KB to 8KB, but the 2KB limit for logic and user
variables per Test Logic remains.
• Up to 20 POU (Program Organizational Units) can be added for each
change (for example, if you currently have 5 POU, you can add 20 more for
a total of 25 POU).
• If a User Defined Function Block is modified that changes the local
variables, the local variables will be reinitialized or reset to zero and a
warning message will be shown during the build. If you want to reapply the
initial value, right-click on the UDFB and select Refactor -> Reset Initial
Values of Instances.
• Exchange files cannot be imported when in RMC because it is considered a
configuration change.
• Global variables cannot be deleted or modified in RMC, but can be added.
To delete or modify a global variable, Connected Components
Workbench must be disconnected from the controller.
See Using Run Mode Change
on page 219 for an example on how to use this
feature.
WARNING: If you delete the output rung when in Run Mode Change and
accept the changes, the output on the controller will remain ON.
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
Error will occur due to insufficient
controller memory remaining
Free RMC memory
Used memory
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