5
REDUNDANT SYSTEM FUNCTIONS
5.3 The System Switching Function
5.3.1 System Switching Method
5 - 42
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) Error message displayed on GX Developer
If the system switching is actually executed due to another reason for system
switching when an attempt of system switching has been made using GX
Developer, the error message (Diagram 5.32) will appear on GX Developer.
(4) Operations When System Switching is Executed in the Standby System
CPU Module
If the manual system switching request is issued to the standby system CPU module,
the system switching will not be executed.
Table5.24 indicates the operations performed when a system switching request is
issued to the standby system CPU module.
Diagram 5.32 Error Dialog Box Displayed on GX Developer
Table5.24 Operations When a System Switching Request is issued to the standby system CPU Module
System Switching
Request
Operation Mode
Backup Mode Separate Mode
System Switching by
System Switching
Instruction
Not performed
The following stop error will occur upon
instruction execution: "OPERATION ERROR
(error code: 4121)".
System Switching
Using GX Developer
The following error message will be displayed on
the GX Developer that was used to perform the
system switching
The following error message will be displayed on
the GX Developer that was used to perform the
system switching
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