System Switching Request To Control System Cpu - Mitsubishi Electric MELSEC Q Series Reference Manual

4.7.2

System switching request to control system CPU

Once the CC-Link IE Controller Network module on the same base as the control system CPU detects a data link error,
it issues a system switching request to the control system CPU.
Depending on the operation status (power OFF, stop error, etc.) of the standby system, however, system switching
may not be executed.
For details, refer to the following.
QnPRHCPU User's Manual (Redundant System)
Control
station No.3
CC-Link IE Controller Network
Control Disconnected
system station No.1
Communication
error
System switching
request
Control
station No.3
CC-Link IE Controller Network
Standby Disconnected
system station No.1
Communication
error
Normal
station No.4
Standby Normal
system station No.2
Tracking cable
Normal
station No.4
Control Normal
system station No.2
System switched
Tracking cable
CHAPTER 4 FUNCTIONS
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