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1.5.4 Features of the Redundant CPU
The features specific to the Redundant CPUs are described below.
(1) Support of the redundant system in addition to the Process CPU functions
(a) Redundant system using the Redundant CPU
Using the Redundant CPU can configure a redundant system including base units, power supply modules, and
CPU modules (Redundant CPUs).
In case of a failure of the control system, the standby system takes over the control in the redundant system,
enabling high reliability of the system.
Figure 1.22 Operation of the Redundant CPU
Standby system
Control system
Data tracking
The power supply module and faulty
module can be changed while the
programmable controller stops.
Operation can be
continued.
Continues control with device
data used by the previous
control system.
New control system
Stop
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