Cpu Memory Reset; Introduction - Siemens SIMATIC ET 200pro Operating Instructions Manual

Commissioning

8.5 CPU memory reset

8.5 CPU memory reset
8.5.1

Introduction

Basics of a memory reset
The CPU must be in STOP mode for a memory reset.
A memory reset returns the CPU to the "initial state".
Memory reset means:
● 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
(with manual memory reset).
● The diagnostics buffer, time of day, and IP address are retained.
● Subsequently the CPU is initialized with the loaded project data (hardware configuration,
code and data blocks, force jobs). The CPU copies this data from the load memory to the
work memory.
Result:
– If you set an IP address in the hardware configuration ("Set IP address in the project"
– Data blocks no longer have current values but rather their configured start values.
– Force jobs remain active.
Detecting a CPU 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 (continuously lit yellow).
84
option) and a SIMATIC memory card with the project is in the CPU, this IP address is
valid after the memory reset.
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC