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1 FUNCTIONS
1.7 Redundant System Function
■Precautions
• When using the module in a redundant master station configuration, check the submaster function precautions before use.
( Page 76 Precautions)
• Manual switching cannot be performed using 'Forced master switching command' (SB0019) of the submaster function.
• As shown below, if the redundant configuration splits into two systems due to such a problem as cable disconnection, a
continuation error occurs in the standby system CPU module because a network configuration mismatch occurs between
the master station (1) and the submaster station (2). While remaining as the standby system, the submaster station
becomes the master operating station (2). However, still being the standby system, it does not send cyclic data. Resolving
the disconnection and returning to a single system will cause the submaster station to resume submaster operation (3).
When the disconnection is resolved (the systems are combined into one system), all the stations are reconnected to a
network. In this case, the system switching may occur depending on the system switching monitoring time set in
"Supplementary Cyclic Settings" under "Application Settings". ( Page 139 Supplementary Cyclic Settings)
Redundant slave station
When an error occurs in the control system, system switching occurs in the redundant system.
The control system slave station (1) stops sending data and send data is transferred to the slave station (2) that has switched
to the new control system to continue data link.
For the system switching operation of the remote head module redundant slave station, refer to the following.
MELSEC iQ-R CC-Link IE Field Network Remote Head Module User's Manual (Application)
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