Siemens SIMATIC S7-400H System Manual page 129

Fault-tolerant systems

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the current operating mode.

System Manual, 03/2012, A5E00267695-11

Operating state of the respective CPU

Maintenance required on standby CPU

Maintenance request on master CPU

Maintenance request on standby CPU

System and operating states of the S7–400H

11.2 System states of the S7–400H