Siemens SIMATIC S7-1500 Manual page 18

Product overview
2.4 Functions
Procedure using the display
You can reach the "Memory reset" menu command by successively selecting
the following menu command and confirming each step with "OK".
● Settings → Reset → Memory reset
Result: The CPU performs a memory reset.
Procedure using STEP 7
Proceed as follows to reset the CPU memory in STEP 7:
1. Open the "Online Tools" task card of the CPU.
2. Click the "MRES" button in the "CPU control panel" pane.
3. Click "OK" to confirm the security prompt.
Result: The CPU is set to STOP mode and the CPU memory reset is performed.
Memory object response to memory reset
The following table gives an overview of which memory objects are retained
and which are initialized upon memory reset.
Table 2- 2
Memory object
Actual values of the data blocks, instance data blocks
Bit memories, timers and counters
Certain retentive tags from technology objects
(e.g. adjustment values of absolute encoders)
Diagnostic buffer entries (retentive area)
Diagnostic buffer entries (non-retentive area)
Operating hours counter
Time
Reference
For more information about "Memory reset", refer to the Memory reset chapter in the
S7-1500 Automation System
(http://support.automation.siemens.com/WW/view/en/59191792) System Manual.
18
Retentive characteristics of the memory objects
Contents
Initialized
Initialized
Retained
Retained
Initialized
Retained
Retained
CPU 1511-1 PN (6ES7511-1AK00-0AB0)
Manual, 01/2013, A5E31264526-AA