First Perform A Memory Reset Of Your Cpu - Siemens SIMATIC S7-300 Quick Start Manual

Configuring and Assigning Parameters to Your S7-300

First Perform a Memory Reset of Your CPU!

Introduction
Before downloading your configuration data to the CPU of your S7-300,
perform a memory reset of the CPU to make sure that it does not contain any
'old' blocks.
How Do You The table below shows you step-by-step how to perform a memory reset on
Proceed? the CPU of your S7-300:
Step
Click on the menu command File
Accessible Nodes in the SIMATIC Manager and
1. select the MPI address of your CPU in the
subsequent dialog box to establish an online
connection.
Display the current operating mode of your CPU
2. with the menu command PLC
Mode...
Set the CPU to STOP by clicking on the 'Stop'
3. button and confirm with "OK". Exit the dialog
box by clicking on "Close".
Call the 'Memory Reset' function with the menu
command PLC
The keyswitch on your CPU must be in the
position "RUN-P" or "STOP".
4.
5-4
Please note that a memory
reset deletes all the user data
Procedure
Open
Operating
Clear/Reset... and confirm.
Primer: S7-300 Programmable Controller, Quick Start
in the CPU!
Result
An online connection to your CPU now exists.
The current mode of your CPU is displayed.
The CPU goes to STOP.
The following process now takes place in the
CPU:
The CPU is reset and the entire user program
is deleted.
The system parameters and the CPU and
module parameters are reset to the default
settings.
The CPU breaks off all existing connections.
C79000-G7076-C500-01