Special functions of a CPU 41x-H
6.3 Resetting the CPU to the factory state
S7-400H
System Manual, 03/2012, A5E00267695-11
81
6.3 Resetting the CPU to the factory state
CPU factory settings
A general memory reset is performed when you reset the CPU to its factory settings and the
properties of the CPU are set to the following values:
Table 6- 2 CPU properties in the factory settings
Properties Value
MPI address 2
MPI transmission rate 187.5 Kbps
Contents of the diagnostic buffer Empty
IP parameters None
IP parameters Default values
Operating hours counter 0
Date and time 01.01.94, 00:00:00
Procedure
Proceed as follows to reset a CPU to its factory settings:
1. Switch off the mains 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 mains voltage on again.
4. Wait until LED pattern 1 from the following 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 following 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 LED pattern 3 from the following overview is displayed, and release the toggle
switch again.
The CPU is now reset to its factory settings. It starts without buffering and goes to STOP
mode. The event "Reset to factory setting" is entered in the diagnostic buffer.
Note
Canceling the operation
If the described operation is canceled prematurely and the CPU remains in an undefined
state, you can once again set it to a defined state by cycling power off and on.
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