4
FUNCTIONS
4.6 Redundant-CPU-Compatible Function
4.6.1 Overview of redundant system operation
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(2) Data link continuation
If an error occurs in the control system CPU or CC-Link IE controller network module,
the control and standby systems will be switched each other and the former standby
system takes over the system control and continues data link.
Remark
There are the following two kinds of system switching.
For details, refer to the following manual.
QnPRHCPU User's Manual (Redundant System)
(1) Switching by the system
• When a fault occurs in the control system
• Switching request from a network module
(2) Switching by the user
• System switching operation from GX Developer
• System switching instruction
Figure 4.67 Data link continuation (when the redundant system has normal stations)
Control
station No.3
Disconnected
station No.1
Normal
station No.2
Disconnected
station No.1
Normal
station No.2
Normal
station No.4
Control
station No.3
Normal
station No.4
CC-Link IE controller network
CC-Link IE controller network
Control
system
Control
system
Standby
system
Standby
system
Tracking cable
Communication error
occurred on control system.
Communication
error
Communication
error
Tracking cable
System switched
Normal station on new control
system continues data link.
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