Special functions of a CPU 41x
3.4 Resetting the CPU to the factory state
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
3-11
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 of the CPU in the factory state
Properties Value
MPI address 2
MPI transmission rate 187.5 Kbps
Contents of the diagnostics buffer Empty
IP parameters None
Operating hours counters o
Date and time 01.01.94, 00:00:00
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
position.
After approx. 4 seconds all the LEDs light up.
6. Wait until LED pattern 2 from the subsequent overview is displayed.
This LED pattern lights up for approximately 5 seconds. During this period you can abort
the resetting procedure by releasing the toggle switch.
7. Wait until the LED pattern 3 from the subsequent overview is displayed and release the
toggle switch again.
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.
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