Siemens SIMATIC ET 200pro Operating Instructions Manual page 103

Maintenance
9.2 Resetting the CPU to factory settings
Procedure using the mode selector
Make sure that the CPU is in STOP mode: The display of the CPU shows the STOP mode.
The RUN/STOP LED lights up yellow.
Note
Reset to factory settings ↔ Memory reset
The procedure described below also corresponds to the procedure for a memory reset:
• Selector operation with inserted SIMATIC memory card: CPU executes a memory reset
• Selector operation without inserted SIMATIC memory card: CPU executes reset to factory
settings
Restore the factory settings of the CPU as follows:
1. Switch off the supply voltages 1L+ and 2L+ of the CPU.
2. Using the cross-tip screwdriver, loosen the 4 screws on the front of the connection
module CM CPU 2PN M12, 7/8".
3. Remove the connection module from the CPU.
4. Remove the SIMATIC memory card from the card slot (see section Inserting/replacing
SIMATIC memory card (Page 76)).
5. Insert the connection module onto the CPU again and screw it into place.
6. Switch on the supply voltages 1L+ and 2L+ of the CPU again.
7. Unscrew the screw cap from the CPU.
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.
102
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC