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Proceed as follows to restore the PLC to the factory settings:
1. Switch on the NCU or press the reset button if the NCU has already been switched on.
The NCU is restarted.
2. Wait until the ERR LEDs flash orange.
3. Set the PLC mode switch to the MRES position until the ERR LED goes dark.
4. Then release the PLC mode switch and immediately turn it back to the MRES position.
The RUN LED flashes orange at a higher frequency.
5. Release the toggle switch.
The PLC is then reset to the factory settings.
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.
4.4.6
DIAG button
Pressing the DIAG has various functions depending on when it is pressed.
Requirements
• Version (functional state) = FS: J
Diagnostic data of the system bootloader
1. Insert a USB stick with FAT file system and directory "beiboot.log" into the NCU (X125/X135).
2. After switching on and while executing the "Beiboot", press the DIAG button on the NCU.
3. The DIAG-LED flashes yellow slowly.
4. If directory "beiboot-log" was found, file "YYYYMMDD-HHMMSS-CCC.txt" is created, which
contains the content of the usual detailed screen and the syslog from "Beiboot".
5. Once the operation has been completed, the DIAG-LED flashes green quickly
NCU 1750
Equipment Manual, 01/2022, A5E45627807B AE
4.4 Operator control and display elements
Description
41
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