Siemens SIMATIC PCS 7 Function Manual page 29

Fault-tolerant process control systems (v8.1)
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Total failure of a redundancy node
The following figure shows a complete system that has ceased to operate due to a failure of
the "Field bus (PROFIBUS DP)" redundancy node.
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
Basics of Fault Tolerance
2.10 Redundancy nodes
29

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