Memory Reset - Siemens SIMATIC S7-1500 Automation System System Manual

Commissioning

8.5 Memory reset

8.5 Memory reset
Basics of a memory reset
A memory reset on the CPU is possible only in the STOP operating mode.
When memory is reset, the CPU is changed to a so-called "initial status".
This means that:
● An existing online connection between your programming device/PC and the CPU is
● The content of the work memory and the retentive and non-retentive data are deleted.
● Subsequently the CPU is initialized with the loaded project data (hardware configuration,
● The diagnostics buffer, the time of day and the IP address are retained, in as far as they
How can I tell if the CPU is performing a memory reset?
The RUN/STOP LED flashes yellow at 2 Hz. After completion the CPU goes into STOP
mode, and the RUN/STOP LED is switched on (unchanging yellow).
Result after memory reset
The following table provides an overview of the contents of the memory objects after
memory reset.
Memory object
Actual values of the data blocks, instance data blocks
Bit memories, timers and counters
Certain retentive tags from technology objects
(for example, adjustment values of absolute encoders)
Diagnostics buffer entries (retentive area)
Diagnostics buffer entries (non-retentive area)
Operating hours counter
Time of day
106
terminated.
code and data blocks, force jobs). These data are copied from the load memory to the
work memory. As a result, the DBs no longer have current values but their initial values.
are not set in the project.
Contents
Initialized
Initialized
Retained
Retained
Initialized
Retained
Retained
S7-1500 Automation System
System Manual, 01/2013, A5E03461182-01