Resetting The Cpu To The Factory State; Table 3-1 Properties Of The Cpu In The Factory State - Siemens SIMATIC S7-400 Manual

3.4

Resetting the CPU to the factory state

Factory state of the CPU
A memory reset is performed when you reset the CPU to its factory state and the properties
of the CPU are set to the following values:
Table 3-1
Properties
MPI address
MPI transmission rate
Contents of the diagnostics buffer
IP parameters
Operating hours counters
Date and time
Procedure
Proceed as follows in order to reset a CPU to the factory state:
1. Switch off the supply voltage.
2. If a memory card is inserted in the CPU, always remove the memory card.
3. Hold the toggle switch in the MRES setting and switch the supply voltage on again.
4. Wait until LED pattern 1 from the subsequent overview is displayed.
5. Release the toggle switch, set it back to MRES within 3 seconds and hold it in this
6. Wait until LED pattern 2 from the subsequent overview is displayed.
7. Wait until the LED pattern 3 from the subsequent overview is displayed and release the
The CPU is now reset to the factory state. It starts without buffering and changes to the
STOP mode. The event "Reset to factory setting" is entered in the diagnostic buffer.
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
Properties of the CPU in the factory state
position.
After approx. 4 seconds all the LEDs light up.
This LED pattern lights up for approximately 5 seconds. During this period you can abort
the resetting procedure by releasing the toggle switch.
toggle switch again.
Special functions of a CPU 41x
3.4 Resetting the CPU to the factory state
Value
2
187.5 Kbps
Empty
None
o
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