Mitsubishi Electric MELSEC iQ-R-R00CPU - Page 445

28 FUNCTIONS
28.2 System Switching
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■System switching request from a network module
A control system network module requests the CPU module for system switching when a communication error or
disconnection is detected. When the control system CPU module receives the system switching request from the network
module, the systems are switched after the END processing.
Ex.
Operation of when the CPU module receives a system switching request from a network module
The following network modules send a system switching request.
• CC-Link IE Controller Network module
• CC-Link IE Field Network module
• Ethernet interface module with built-in CC-Link IE
If a network module cable is disconnected, the systems may not be switched depending on the timing of error detection on the
control system and the timing on the standby system. ( Page 453 When the cable for the network module is
disconnected)
END
Program executed
System switching request from a network module
System A
System B
System switching
Standby system
Program stopped
Program executed
Control system
Control system
Program stopped
Standby system