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4.6 Redundant-CPU-Compatible Function
4.6.2 System switching request to control system CPU
4
FUNCTIONS
(1) System switching factor
If the data link error status (the D.LINK LED is off) is continued for the period of
system switching monitoring time or longer, a system switching request will be issued
to the control system CPU.
(2) Setting System switching monitoring time
Set a System switching monitoring time in [Network range assignment] of the control
station.
Section 6.3 Network Range Assignment
(3) Disabling system switching that is caused by a data link error
Setting Data-link-error-induced system switching disable flags (SB0017) of both
systems to ON in advance prevents a system switching request from being issued to
the control system CPU even if a data link error is detected.
*1
Appendix 1 Link Special Relay (SB) List
* 1 Tracking-transfer the Data-link-error-induced system switching disable flag (SB0017).
Remark
Use this flag to prevent an undesired system switching during network
maintenance (e.g. cable replacement), which may caused by a data link error due
to incorrect operation.
(4) System switching that is caused by a network module error
Upon detection of an error that disables data link, such as hardware failure of a
CC-Link IE controller network module, a system switching request is issued to the
control system CPU.
Note that system switching due to a network module error is executed regardless of
System switching monitoring time and the status of Data-link-error-induced system
switching disable flag (SB0017).
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