Special functions of the CPU 410
9.10 Response to fault detection
CPU 410 Process Automation/CPU 410 SMART
144 System Manual, 05/2017, A5E31622160-AC
Response to fault detection
Response to fault detection
In order to ensure a high level of reliability, in particular, of the fault tolerant system, the CPU
410 has many self diagnostics. Faults can thus be detected and eliminated at an early stage.
In the rare instance that a fault occurs that cannot be eliminated by the firmware, the current
service data is saved internally for further evaluation by SIEMENS specialists. An automatic
reboot is then started. This behavior reduces the downtime of the CPU to a minimum.
Access to the process is restored as soon as possible.
Automatic reboot in the event of a one-sided defect in the fault-tolerant system
The defective CPU performs the complete self-test. The other CPU remains in RUN. If a
hardware fault is detected, the CPU switches to DEFECTIVE operating state. If no fault is
detected, the CPU links up again. The H system switches back to the redundant system
state.
You can use the "Save service data" function immediately afterwards to save the necessary
data during operation.
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