GE PACSystems RX7i Reference Manual page 184

Chapter 4. CPU Operation
PACSystems Handling of GBC Faults
Defaulting of input data associated with failed/lost GBCs
When a GBC is missing, mismatched, or otherwise failed, the CPU applies the Input Default setting for
each device on that Genius bus when defaulting the input data. If the device is configured for HOLD LAST
STATE, the data is left alone. If the device is configured for OFF, the input data is set to 0. If a redundant
GBC is operational, the input data is not affected.
Application of default input and diagnostic data for lost redundant blocks
When a GBC reports that a redundant block is lost, the CPU updates the input data tables and input
diagnostic tables with the default data during the very next input scan. The output diagnostic data tables
are updated during the very next output scan.
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