MANAGING MEMORY
SNAP PAC Redundancy Option User’s Guide
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Managing Memory
Controllers have various settings that can be configured, usually with PAC Manager, that are stored
in RAM. You can use PAC Redundancy Manager to manage a redundant controller's memory, such
as storing and erasing strategies and configurations in flash memory or on a microSD card (for SNAP
PAC controllers manufactured in November 2008 and later that have a microSD card slot in the top
of the controller’s case).
Saving to flash protects a configuration from being lost if the controller is turned off. When you save
to flash, the new configuration overwrites any configuration already in the flash memory.
CAUTION: Updating a redundant controller's memory can disrupt a running system. During the update,
the controller must be placed into Maintenance mode, during which time it cannot be the Active controller.
If the controller is currently Active, the strategy will be stopped. If there is a qualified Backup controller, it will
become Active.
The following options are available in PAC Redundancy Manager:
Strategy Memory.
The following commands are available:
•
Store Strategy to Flash: Saves the strategy to flash memory. Only one strategy at a time can be
stored in flash memory.
•
Erase Strategy from Flash: Erases the strategy currently stored in flash memory.
•
Erase Strategy from RAM: Erases the strategy from RAM.
Configuration Flash Memory.
The following commands are available:
•
Store Configuration to Flash: Saves the configuration to flash memory.
•
Erase Configuration from Flash: Erases the configuration stored in flash memory, which
includes:
–
Clears error information in the status area (error code, transaction label, source address,
error address).
–
Clears gains and offsets, counters (which are also deactivated),
