Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 187
Program the Redundant Controller Chapter 7
Reserve Memory for Tags and Logic
Depending on your redundant application, you may need to change the memory
usage property for your redundant controller. The setting you specify impacts
how the controller divides memory for tags and logic to be stored to the buffer
during a crossload to the secondary controller.
This table indicates when you might need to change the memory usage setting.
For most applications, we recommend that the Memory Usage slider
remain at its default position (center).
Table 34 - Possible Memory Usage Setting Change
If your online edits are primarily changes to Then move the Memory Usage slider towards
Tags with little or no changes to logic Tags
Logic with little or no new tags created Logic
Do not set the Memory Usage slider all the way to Tags or Logic:
• If you move the slider all the way to Tags, you may not be able to perform edits while online
and OPC communication may fail.
• If you move the slider all the way to Logic, you cannot create or edit any tags while online.
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