Simple Dual-Structured System (High Performance Model Qcpu And Process Cpu) - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

2 SYSTEM CONFIGURATION

2.1.3 Simple dual-structured system (High Performance model QCPU and Process CPU)

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In a simple dual-structured system, "regular" and "standby" network modules are
installed in each CPU module, so that if the regular network is down, the data link can
still be continued by switching to the standby network through link data refresh.
For details, refer to Section 7.7.
Control station
Q25H
CPU
Network No. 1
Q25H
CPU
POINT
Simple dual-structured system cannot be configured with the Basic model QCPU,
Redundant CPU, and Universal model QCPU. These CPUs are applicable for a
single network system.
Normal station
Q25H
CPU
Network No. 2
Q25H
CPU
MELSEC-Q
Normal station
Q25H
CPU
Regular
network
Standby
network
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