3.3 Multi-CPU Functions
Sub CPU Synchronization
3-102
Differences between the Main CPU Unit and Sub CPU Units
The following table gives the differences between the Main CPU Unit and Sub CPU Units. Items for
which there are no differences between the Main CPU Unit and Sub CPU Units have been omitted.
Although the Main CPU Unit and Sub CPU Units will have the same calender settings after the
power supply is turned ON, thereafter they run on their own power supplies. This can cause error
to occur between the calendar settings of the Main CPU Unit and Sub CPU Units as time passes.
If that occurs, set only the Sub CPU Units.
Item Main CPU Unit Sub CPU Unit
Connected Rack Can be connected only to Rack 1.
Can be connected to Rack 1 or 5 to 7.
If you connect the Sub CPU Unit to
Rack 1, connect it to the right of the
Main CPU Unit.
Function Modules in CPU Unit
•CPU
• 218IFD
•SVC32
•SVR32
•M-EXECUTOR
•CPU
• 218IFD
•SVC32
•SVR32
•M-EXECUTOR
•CPUIF
Self Configuration Recognizes Sub CPU Units.
Does not recognize the Main CPU
Unit.
Starting and Stopping CPU Units
The Main CPU Unit can be started
and stopped independently.
Doing so will not cause the Sub CPU
Units to start or stop.
A Sub CPU Unit can be started and
stopped independently.
However, the start/stop link with the
Main CPU Unit will be given priority.
Calendar
• Set with the MPE720.
• Set with system registers.
• Calendar settings are synchronized
with the Main CPU Unit when the
power supplies are turned ON.
• Set with the MPE720.
• Set with system registers.
Sub CPU Unit Status
Reported in system registers
SW001475 to SW001482 (system
status).
Reported in system registers
SW00040 to SW00041 (system sta-
tus).
Synchronization Status between
CPU Units
Not reported in system registers.
Reported in system register
SB00040B (synchronization status
with Main CPU Unit).
WDT Errors
WDT error in
Main CPU Unit
• Error number E.001 is displayed on
the CPU Unit.
• Reported by placing 0001 hex
(watchdog timer timeout) in system
register SW00050 (32-bit error
code).
• Error number E.052 is displayed on
the CPU Unit.
• Reported by placing 0052 hex
(Main CPU Unit system down
detected) in system register
SW00050 (32-bit error code).
WDT error in
Sub CPU Unit
• Error number E.051 is displayed on
the CPU Unit.
• Reported by placing 0051 hex
(Module synchronization error) in
system register SW00050 (32-bit
error code).
• Error number E.001 is displayed on
the CPU Unit.
• Reported by placing 0001 hex
(watchdog timer timeout) in system
register SW00050 (32-bit error
code).
Continued on next page.
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