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CPU 1 becomes the backup CPU and switches from the STOP operating state to the
SYNCUP operating state.
Synchronization starts as detailed in the section SYNCUP system state (Page 205)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:
● In STEP 7, for example when the R/H-CPUs are far apart
● Using the mode selectors on the CPUs, you can change the operating states of the CPUs
and therefore the system 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.
Note
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 STOPthrough the displays by switching both CPUs to the operating state RUN or STOP .
SIMATIC Display Simulator
A simulation of the display of the available menu commands is available in the
SIMATIC Display SimulatoThe system state is displayed on the R/H system operating panel (Online & diagnostics).
Changing the system state:
On the R/H system control panel (Online & diagnostics):
● STOP system state: Press the STOP R/H-System buttonOn the CPU control panels (Online & diagnostics):
● RUN-Redundant system state: Press the RUN R/H-System button on both CPU operator
panels.
Note
Please note that you cannot switch the R/H system to the RUN-Redundant
system state over the R/H system control panel. You implement the RUN-Redundant
system state by switching each CPU on its control panel to RUN.Memory resets can be performed for the primary and for the backup CPU. Memory resets
are generally only useful for the primary CPU.
Reason: Following a primary CPU memory reset, you need to trigger synchronization for
redundant operation. In SYNCUP, the backup CPU is synchronized with the retentive data
from the primary CPU. Following SYNCUP, the backup CPU processes the same user
program as the primary CPU.
The memory reset process for R/H-CPUs is identical to that for the standard CPUs.
The CPU must be in the STOP operating state for a memory reset.
A memory reset returns the CPU to its "initial state".
Note
A memory reset only ever affects the CPU to which you have applied the function. For a
memory reset of both CPUs, apply the function to each in turn.
Memory reset means:
● An existing online connection between your programming device/PC and the CPU is
terminated.
● The content of the work memory and the retentive and non-retentive data are deleted (in
a manual memory reset).
● The diagnostics buffer, time of day, and IP address are retained.
● Subsequently the CPU is initialized with the loaded project data (hardware configuration,
code and data blocks, force jobs). The CPU copies this data from the load memory to the