Commissioning
9.5 CPU memory reset
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
233
9.5.2
Manual memory reset
Reason for manual memory reset
Memory reset is required to reset the primary or backup CPU to its "initial state". Memory
resets can only be run in the STOP operating state of a CPU.
CPU memory reset
There are three options for performing a CPU memory reset:
●
Using the mode selector
●
Using the display
●
Using STEP 7
Procedure using the mode selector
Note
Memory reset
↔ Reset to factory settings
The procedure described below also corresponds to the procedure for resetting to factory
settings:
•
Selector operation with inserted SIMATIC memory card: CPU executes a memory reset
•
Selector operation without inserted SIMATIC memory card: CPU executes reset to factory
settings
Proceed as follows for a CPU memory reset using the mode selector:
1.
Set the mode selector master interface module to STOP.
Result: The RUN/STOP LED lights up yellow.
2.
Set the mode selector master interface module to MRES. Hold the selector in this position
until the RUN/STOP LED lights up for the 2nd time and remains continuously lit (this
takes three seconds). Then release the switch.
3.
Within the next three seconds, switch the mode selector back to the MRES position and
then back to STOP.
Result: The CPU executes a memory reset.
For information on resetting the CPU to factory settings, please refer to the section Resetting
CPUs to factory settings (Page 277).
Procedure using the display
To navigate to the required "Memory reset" menu item, select the following sequence of
menu commands and confirm each selection with "OK".
●
Settings
→ Reset → Memory reset
Result: The CPU executes a memory reset.
Summary of Contents for Simatic S7-1500H
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