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4-16 Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide
–
May 2000 GFK-1527A
4
Example 2: Role switches allowed on both units
The Secondary unit drives the outputs in this example.
Primary Unit Secondary Unit
Role
Active Backup
Operating Mode
RUN/DISABLED RUN/ENABLED
OK LED on RCM
ON ON
LOC_RDY LED on RCM and %S Bit
OFF ON
LOC_ACT LED on RCM and %S Bit
ON OFF
REM_RDY LED on RCM and %S Bit
ON OFF
REM_ACT LED on RCM and %S Bit
OFF ON
Example 3: Role switches not allowed on either unit
Primary Unit Secondary Unit
Role
Active Backup
Operating Mode
RUN/ENABLED RUN/DISABLED
OK LED on RCM
ON ON
LOC_RDY LED on RCM and %S Bit
ON OFF
LOC_ACT LED on RCM and %S Bit
ON OFF
REM_RDY LED on RCM and %S Bit
OFF ON
REM_ACT LED on RCM and %S Bit
OFF ON
Example 4: Role switches allowed on both units
Primary Unit Secondary Unit
Role
Active Backup
Operating Mode
RUN/DISABLED RUN/DISABLED
OK LED on RCM
ON ON
LOC_RDY LED on RCM and %S Bit
OFF OFF
LOC_ACT LED on RCM and %S Bit
ON OFF
REM_RDY LED on RCM and %S Bit
OFF OFF
REM_ACT LED on RCM and %S Bit
OFF ON