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MELSEC-Q
7 APPLICATION FUNCTIONS
7.10 Configuring a Network with a Redundant System
This section outlines the operation of a redundant system and describes the network
parameters to be set to configure a redundant system with the MELSECNET/H.
7.10.1 Outline of the redundant system operation
Described below is an outline of the redundant system operation.
(1) Operation of a redundant system
(a) Continuing a data link
If an error has occurred in the control system CPU or a network module,
the system will be switched to the standby system on which system control
and a data link can be continued.
[Example: When the redundant system is used for a normal station]
Control station
(station No. 3)
MELSECNET/H PLC to PLC network
Control station
(station No. 3)
A communication
error occurs.
Control system
Normal station
(station No. 1)
Standby system
Normal station
(station No. 4)
A communication error occurs in the control system.
MELSECNET/H PLC to PLC network
System switching
request
Communication
impossible
Control system
Standby system
The normal station of
the new control system
continues a data link.
Normal station
(station No. 4)
Normal station
(station No. 2)
Normal station
(station No. 2)
Normal station
(station No. 1)
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