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Siemens SIMATIC S7-1500 Automation System User Manual

Siemens SIMATIC S7-1500 Automation System
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Commissioning
8.5 Memory reset
S7-1500 Automation System
106 System Manual, 01/2013, A5E03461182-01
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
terminated.
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,
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.
The diagnostics buffer, the time of day and the IP address are retained, in as far as they
are not set in the project.
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 Contents
Actual values of the data blocks, instance data blocks Initialized
Bit memories, timers and counters Initialized
Certain retentive tags from technology objects
(for example, adjustment values of absolute encoders)
Retained
Diagnostics buffer entries (retentive area) Retained
Diagnostics buffer entries (non-retentive area) Initialized
Operating hours counter Retained
Time of day Retained

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Siemens SIMATIC S7-1500 Automation System Specifications

General IconGeneral
SeriesSIMATIC S7-1500
ProgrammingTIA Portal (Totally Integrated Automation Portal)
Protection ClassIP20
CPUVarious models available (e.g., CPU 1511-1 PN, CPU 1518-4 PN/DP)
Controller TypeModular Controller
Programming LanguagesLAD, FBD, STL, SCL, GRAPH
Communication InterfacesPROFINET, PROFIBUS, Ethernet, OPC UA
Digital InputsVaries by model and expansion modules
Digital OutputsVaries by model and expansion modules
Analog InputsVaries by model and expansion modules
Analog OutputsVaries by model and expansion modules
Backplane BusHigh-speed backplane bus for fast communication between modules
RedundancySupported with specific models and configurations
SafetyIntegrated safety functions available
ScalabilityHighly scalable with modular expansion
Operating Temperature0°C to 60°C

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