Mitsubishi Q12PRHCPU - Page 89

5
REDUNDANT SYSTEM FUNCTIONS
5.1 Basic Concept of Redundant System
5.1.2 Determination of Control System and Standby System
5 - 6
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
5
REDUNDANT SYSTEM FUNCTIONS
6
REDUNDANT SYSTEM NETWORKS
7
PROGRAMMING CAUTIONS
8
TROUBLESHOOTING
(b) When system B starts up first
(2) When System A and System B Start Up Simultaneously *
4
*
5
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".
* 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.
Diagram 5.5 Control System and Standby System when System B Starts Up First
Diagram 5.6 Control System and Standby System
when System A and System B Start Up Simultaneously
System A
System B
Tracking cable
Standby system Control system
1), 2) show the powerup
procedure.
2) Turn on the power for System A.
1) Turn on the power for System B.
System A
System B
Tracking cable
Control system Standby system
Power on both systems simultaneously.