Mitsubishi Q12PRHCPU User Manual page 89

5
REDUNDANT SYSTEM FUNCTIONS
(b) When system B starts up first
(2) When System A and System B Start Up Simultaneously *
If system A and system B start up simultaneously, system A will be the "Control
system", and system B will be the "Standby system".
If the system A and system B CPU modules are reset (RESET/L.CLR switch is set to
the RESET position) and unreset (RESET/L.CLR switch is set to the neutral position)
simultaneously, system A will be the "Control system", and system B will be the
"Standby system".
Standby system
System A
Tracking cable
2) Turn on the power for System A.
Diagram 5.5 Control System and Standby System when System B Starts Up First
Control system
System A
Power on both systems simultaneously.
Diagram 5.6 Control System and Standby System
when System A and System B Start Up Simultaneously
* 4: Refer to Section 5.1.1 for determination of system A and system B.
* 5: This indicates the following cases:
•One system starts up and the other starts up within 3 seconds.
•When one CPU module is unreset (RESET/L.CLR switch is set to the neutral position) within 3
seconds of the other.
5.1.2 Determination of Control System and Standby System
Control system
System B
1) Turn on the power for System B.
Standby system
System B
Tracking cable
5.1 Basic Concept of Redundant System
1), 2) show the powerup
procedure.
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