Redundant System (Redundant Cpu) - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

2 SYSTEM CONFIGURATION

2.1.2 Redundant system (Redundant CPU)

Control system
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The redundant system refers to a system where a system including a network module
is dualized by connecting another network module to another redundant CPU
(redundant system).
If failure of the control system CPU or a network module occurs, the redundant system
switches the control system to the standby system, allowing system control and data
linking to be continued on the standby system.
For details, refer to Section 7.10.1.
MELSECNET/H PLC to PLC network
POINT
The QJ71NT11B does not support the Redundant CPU.
Standby system
MELSECNET/H remote I/O network
MELSEC-Q
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