System and operating states of the S7–400H
11.2 System states of the S7–400H
S7-400H
128 System Manual, 03/2012, A5E00267695-11
11.2.6 System diagnostics of a fault-tolerant system
The diagnose hardware function identifies the state of the entire fault-tolerant system.
Procedure:
1. Select the fault-tolerant station in SIMATIC Manager.
2. Select the PLC >
Diagnose hardware
menu command.
3. In the "Select CPU" dialog, select the CPU and confirm with OK.
Result:
The operating state of the selected CPU can be identified based on the display of the
selected CPU in the "Diagnose hardware" dialog:
CPU icon Operating state of the respective CPU
Master CPU is in RUN state
Standby CPU is in RUN state
Master CPU is in STOP state
Standby CPU is in STOP state
Master CPU is in STARTUP state
Standby CPU is in LINK-IN or UPDATE state
Standby CPU is in ERROR-SEARCH operating state
Malfunction of the master CPU or of a module parameterized by it.
Malfunction of the standby CPU, or of a module parameterized by it.
Maintenance required on master CPU
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