Mitsubishi Q12PRHCPU - Page 90

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5.1 Basic Concept of Redundant System
5.1.2 Determination of Control System and Standby System
5
REDUNDANT SYSTEM FUNCTIONS
(3) When Only One System Starts Up
Whichever system that starts up first will be the "Control system".
*6
Also, if the control system is already on, the other system will be the "Standby" system
when it starts up.
* 6: The "STANDBY SYS. DOWN (error code: 6300) continuation error will occur in the control system
CPU module.
By disabling "Check standby system malfunction," at the standby System Monitor settings in the
redundant parameter operation mode settings with GX Developer, the control system will not
detect the "STANDBY SYS. DOWN" continuation error.
(4) Confirming the Control System/Standby System
*7
Identify the control system and standby system by checking the "CONTROL" LEDs. of
CPU modules.
Refer to the following manual, for details on the CPU module LED :
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
* 7: The control system and standby system can be identified by checking whether the special relays
"Control/Standby Status flag (SM1515)" and "Control/Standby Status flag (SM1516)" are ON or
OFF.
Diagram 5.7 Control System when Only One System Starts Up
Table5.3 Confirming the control system and standby system by checking the "CONTROL" LEDs
CPU module LED LED status
LED Name
Control
System
Standby
System
CONTROL ON OFF
Table5.4 Confirming SM1515 and SM1516 to Identify Control
system and Standby system
SM1515 SM1516
Control system ON OFF
Standby system OFF ON
Tracking cable
Control system
Turn on the power.
Leave the power in OFF position.
Q12PRHCPU
MODE
RUN
ERR.
USER
BAT.
BOOT
BACKUP
CONTROL
SYSTEM A
SYSTEM B