Siemens SIMATIC S7-400H Manual page 204

Fault-tolerant systems
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Glossary
Two-channel fault-tolerant system
A fault-tolerant system having two central processing units
Update
In the system mode update a fault-tolerant system the master CPU updates the
dynamic data of the standby CPU.
Glossary-4
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04

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