Manual Memory Reset - Siemens SIMATIC S7-1500 System Manual

11.5.2

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 / mode selector keys
• Using the display
• Using STEP 7
Procedure using the mode selector (R/H CPUs with article numbers 6ES7513-1RL00-0AB0,
6ES7515-2RM00-0AB0, 6ES7517-3HP00-0AB0, 6ES7518-4JP00-0AB0)
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 to STOP.
Result: The RUN/STOP LED lights up yellow.
2. Set the mode selector to MRES. Hold the switch in this position until the RUN/STOP LED
lights up for the second time and remains continuously lit after three seconds. Then
release the mode selector.
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, refer to the section Reset CPUs to
factory settings (Page 338).
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.5 CPU memory reset
297