Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
415
12.4.9 Displaying and changing the system state
Introduction
For commissioning and service, you require information on the system state of the redundant
system. Examples:
• The redundant system does not switch to the RUN-Redundant system state upon initial
commissioning.
• The primary CPU has failed due to a fault.
Options
You have the following options for displaying and changing the system state of the S7-
1500R/H redundant system:
• Using the mode selectors on the CPUs, you can change the operating states of the CPUs
and therefore the system state
• Via the displays of the primary and backup CPU
• In STEP 7, for example when the R/H-CPUs are far apart
Display of the primary and backup CPU
Displaying the operating state:
The operating state of the primary and backup CPU is shown in the status information in the
top section of the displays. The two operating states define the system state.
Examples:
• Status information for the primary and backup CPUs: RUN-Redundant, RUN-Redundant.
Result: The system state is RUN-Redundant.
• Status information for the primary and backup CPUs: RUN, STOP. Result: The system state
is RUN-Solo.
Changing the operating state:
Switch the CPU to the required operating state in the "Settings > RUN / STOP" menu of the
display.
Please note that you can only implement the system states RUN
-Redundant and STOP
through the displays by switching both CPUs to the operating state RUN or STOP .
SIMATIC S7-1500 Display Simulator
A simulation of the display of the available menu commands is available in the
SIMATIC S7-1500 Display Simulator
(https://support.industry.siemens.com/cs/ww/en/view/109761758).
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