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Description
4.4 Operator control and display elements
Restoration of the factory settings when the PLC powers up
While the control system powers up, you can delete the user program of the PLC via the toggle
switch position MRES. When doing this, the PLC SD Card is cleared and the remanent data
initialized. The PLC IP addresses of the X150/X160 interfaces assigned via the TIA Portal are also
deleted.
The procedure is divided into requesting and acknowledging the deletion request. The
controller can then no longer be set to RUN as long as no project has been loaded.
1. Switch on the NCU or press the RESET button if the NCU has already been switched on.
The NCU restarts, all PLC LEDs light up orange.
2. Wait until the ERR_LED starts flashing alternately green/orange.
3. Request: At this moment at the latest, set the PLC mode switch to the MRES position and hold
the PLC mode switch in this position until the ERR_LED goes out.
The PLC recognizes the deletion request.
4. Acknowledgment:
– Now release the PLC mode switch.
– Briefly press the PLC mode switch to the MRES position and release it again.
Note
As soon as the ERR_LED goes out, perform the acknowledgement steps within max.
3 seconds.
5. When the request has been correctly acknowledged, the RUN LED flashes orange approx. 5
times.
Once the PLC has rebooted, it is deleted.
If the RUN LED does not flash approx. 5 times, the request did not function. Repeat steps 1-5.
4.4.5
RESET button
Arrangement
The RESET button is located behind the service cover.
Performing a reset operation
The reset operation resets the NCU and forces a new ramp-up. It is similar to a "Power On Reset"
except that the 24 V power supply does not have to be switched off.
42
The PLC mode switch automatically jumps back to the STOP position.
The PLC mode switch automatically jumps back to the STOP position.
Equipment Manual, 10/2023, A5E45627807B AH
NCU 1750
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