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4.6 Redundant-CPU-Compatible Function
4.6.1 Overview of redundant system operation
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FUNCTIONS
(3) Pairing settings for the redundant system
When a network contains a redundant system, pairing settings are required for
network parameters of the control station.
*1
Select the control station's [Network range assignment] - [Pairing] to configure the
settings.
* 1 Check the serial No. and software version for applicability.
Appendix 3 Functional Upgrade of CC-Link IE controller network
(4) Project file in GX Developer
For a redundant system, create parameters and programs in one project file and write
them to programmable controllers of both systems.
(5) Precautions
(a) When the redundant system is in the debug mode
Do not connect the CC-Link IE controller network modules on both systems to the
network at the same time.
In the debug mode, system B CPU also operates with the same parameters as
system A. Therefore, duplication of the control station and station number is
detected at the time of concurrent connection to the network.
(b) Error detection due to power ON/OFF of another station (including the standby
system)
A system switching request may be issued due to detection of a temporary data
link error in the following cases:
• Power ON/OFF of another station (including the standby system)
• Boot or shutdown of a personal computer with a CC-Link IE controller
network interface board
If the above system switching request is issued before startup of the standby
system, a continue error, "CAN'T SWITCH" may be detected in the control system
CPU.
Since normal control can be continued even if "CAN'T SWITCH" is detected,
program the system properly so that this error detection will not stop the control.
For information on how to clear "CAN'T SWITCH", refer to the following manual.
QnPRHCPU User's Manual (Redundant System)
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