Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 613

■System switching request from a network module
A control system network module requests the CPU module to switch systems 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 in the END processing.
Ex.
Operation of when the CPU module receives a system switching request from a network module
System switching request from a network module
Program executed
Control system
System A
System B
Standby system
Program stopped
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 621 When the cable for the network module is
disconnected)
END Program stopped
Standby system
System switching
Control system
Program executed
37 FUNCTIONS
611
37.1 System Switching
37