Mitsubishi Q12PRHCPU - Page 133

5
REDUNDANT SYSTEM FUNCTIONS
5.3 The System Switching Function
5.3.3 System Switching Execution Possibility
5 - 50
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
Table5.34 Operating Status and Details
Operating Status Description
Normal
The CPU module is in the RUN, STOP or PAUSE status, where no error such as a continuation error or stop
error has occurred.
Continuation Error The CPU module is in the RUN, STOP and PAUSE status, where a continuation error has occurred.
Stop Error The CPU module has stopped, as a stop error has occurred.
Power Off The system power is OFF.
Resetting The CPU module is being reset.
At network fault detection
A fault has been detected by at least one module of standby system network modules
(CC-Link IE Controller Network module, MELSECNET/H module, Ethernet module, PROFIBUS-DP master
module).
Preparing for Tracking The communication is not made between the control system and standby system via tracking cable.
System Switching
Request Timeout
The system switching has not been completed, as a data error occurred due to noise, etc., in the
communication between the control system and standby system during system switching processing.
Executing System
Switching
System switching cannot be executed since the control system or standby system is executing system
switching due to the previous system switching condition.
Table5.35 Operations When System Switching Cannot Be Executed Due to Operation mode, i.e., Separate Mode
System
Switching
Method
Control System
Switching Condition
Before System Switching
System Status After
System Switching
Condition
Operation After Changing From
Separate Mode to Backup Mode
System A System B System A System B
Automatic
System
Switching
Stop Error Other Than
Watchdog Timer Errors
Control
System
Standby
System
Control
System
Standby
System
System switching will not be executed.
Watchdog Timer Error
Control
System
Standby
System
Control
System
Standby
System
System switching will not be executed.
Hardware Failure
Control
System
Standby
System
Control
System
Standby
System
Cannot change from Separate Mode to
Backup Mode due to a control system
hardware failure.
Power OFF
Control
System
Standby
System
Control
System
Standby
System
Cannot change from Separate Mode to
Backup Mode due to control system
power OFF.
Reseting
Control
System
Standby
System
Control
System
Standby
System
Cannot change from Separate Mode to
Backup Mode due to control system
reset status.
System Switching
Request by Network
Module
Control
System
Standby
System
Control
System
Standby
System
System switching will not be executed.
Manual
System
Switching
System Switching
Using GX Developer
Control
System
Standby
System
Standby
System
Control
System
System switching will not be executed.
System Switching by
System Switching
Instruction
Control
System
Standby
System
Standby
System
Control
System
System switching will not be executed.