Siemens Simatic ET200pro Operating Instruction page 103

8. Set the mode selector to the STOP position.
Result: The RUN/STOP LED lights up yellow.
9. Set the mode selector to the MRES position. Hold the mode switch in this position until
the RUN/STOP LED lights up for the 2nd time and remains continuously lit (this takes
three seconds). After this, release the switch.
10.Within the next three seconds, switch the mode selector back to the MRES position, and
then back to STOP again.
Result: The CPU executes a "Reset to factory settings", during which time the RUN/STOP
LED flashes yellow. When the RUN/STOP LED lights up yellow, then the CPU has been
reset to factory settings, and is in the STOP mode. The "Reset to factory settings" event is
entered into the diagnostics buffer.
Note
The IP address of the CPU is also deleted when the CPU is reset to the factory settings
through the mode selector.
Procedure using STEP 7
To reset a CPU to factory settings using STEP 7, follow these steps:
Make sure that there is an online connection to the CPU.
1. Open the Online and Diagnostics view of the CPU.
2. In the "Functions" folder, select the "Reset to factory settings" group.
3. If you want to keep the IP address, select the "Keep IP address" option button. If you
want to delete the IP address, select the "Delete IP address" option button.
4. Click the "Reset" button.
5. Click "OK" in response to the confirmation prompts.
Result: The CPU executes a "Reset to factory settings", during which time the RUN/STOP
LED flashes yellow. When the RUN/STOP LED lights up yellow, then the CPU has been
reset to factory settings, and is in the STOP mode. The "Reset to factory settings" event is
entered into the diagnostics buffer.
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
9.2 Resetting the CPU to factory settings
Maintenance
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