Mitsubishi Q12PRHCPU - 5.9 Network Module Redundant Group Settings

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5.9 Network Module Redundant Group Settings
5
REDUNDANT SYSTEM FUNCTIONS
5.9 Network Module Redundant Group Settings
(1) Network Module Redundant Group Settings
When a pair of Ethernet modules is used in each system of the redundant system, by
making the network module redundant group settings of the Ethernet modules,
system switching can be disabled even if an error occurs in one network.
However, if a communication error occurs in both Ethernet modules, system switching
will occur.
[Example:]
Diagram 5.92 and Diagram 5.93 show the operations when an error occurs in the
communication between the control system and standby system via the Ethernet.
• Diagram 5.92 show the processes that take place when a malfunction occurs on
one of the networks with network module redundant group settings.
• Diagram 5.93 the processes that take place when a malfunction occurs on both
networks with network module redundant group settings.
Diagram 5.92 Operation When Error Occurs on One of the Networks
Diagram 5.93 Operation When Error Occurs on Both Networks
System A
System B
Tracking cable
Control system Standby system
System A
System B
Tracking cable
Control system Standby system
One of the modules set in the redundant group
setting has requested a system switching
Systems did not switch
OPS OPS OPS OPS
Commu-
nication
error
Commu-
nication
error
System A
System B
Tracking cable
Control system Standby system
System A
System B
Tracking cable
Standby system Control system
Systems will switch
OPS
OPS OPS OPS
Commu-
nication
error
Commu-
nication
error
Both modules set in the network module redundant
group setting have requested a system switching
Commu-
nication
error
Commu-
nication
error