Mitsubishi Electric MELSEC Q Series Reference Manual page 34

(7) Configuration of a redundant system (Compatibility with redundant CPUs)
( Page 138, Section 4.7)
(a) Redundant system using CC-Link IE Controller Network modules
By mounting a CC-Link IE Controller Network module to each of base units with redundant CPUs, a redundant
system can be configured.
If an error occurs in the control system CPU or CC-Link IE Controller Network module, the control and standby
systems will be switched each other, and the standby system will take over the system control and data link.
(b) System switching request to the control system CPU
When the CC-Link IE Controller Network module of the control system CPU detects a data link error, it can
issue a system switching request to the control CPU.
(c) Transient transmission to a redundant system
With a link dedicated instruction or programming tool, device data can be read from or written to its own
system, control/standby system, system A/B of a redundant system, and remote RUN/STOP can be controlled.
By specifying the target station's CPU type to Control or Standby system, the target can be fixed even if a
system switching occurs.
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CC-Link IE Controller
Network module
Control
station No.3
CC-Link IE Controller Network
Normal
Control system
station No.1
Tracking cable
Normal
station No.4
Normal
Standby system
station No.2