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67GFK-0827 Chapter 4 Operation
E. Role switches are allowed on both units.
Primary Unit Secondary Unit
Backup Active (see NOTE below)
RUN/ENABLED RUN/ENABLED
XOK XOK
X LOC_RDY X LOC_RDY
LOC_ACT X LOC_ACT
X REM_RDY X REM_RDY
X REM_ACT REM_ACT
F. Role switches are not allowed on either unit.
Primary Unit Secondary Unit
Backup Active (see NOTE below)
RUN/DISABLED RUN/ENABLED
XOK XOK
LOC_RDY X LOC_RDY
LOC_ACT X LOC_ACT
X REM_RDY REM_RDY
X REM_ACT REM_ACT
G. Role switches allowed on both units.
Primary Unit Secondary Unit
Backup Active (see NOTE below)
RUN/DISABLED RUN/DISABLED
XOK XOK
LOC_RDY LOC_RDY
LOC_ACT X LOC_ACT
REM_RDY REM_RDY
X REM_ACT REM_ACT
H. The following situation is not valid. If detected, the units will switch roles
automatically and behave as in (C) above.
Primary Unit Secondary Unit
Backup Active (see NOTE below)
RUN/ENABLED RUN/DISABLED
Note
* Secondary unit active is not a recommended mode of operation.
Configuration of Fault Actions
With the Redundancy CPU, you cannot select to configure certain faults to be FATAL
(causing the CPU to STOP). Whenever the system is in redundancy mode with a backup
unit available, the decision as to which faults are FATAL and therefore will cause a
switch to the backup CPU are made by the operating system and are not configurable.