BECKHOFF CX9000 - Manual (Page 25)

Product overview
Embedded PC 23
Force TwinCAT in "Config Mode":
For some cases (e.g. errors in boot project) it is necessary to start TwinCAT in Config mode. So the boot project can
be corrected or other settings can be (re)setted.
1. Set dip switch 4 to ON (move switch 4 up).
2. Connect CX-System to power and boot system.
3. Make changes to the PLC
4. power down the system. Set dip switch 4 back to OFF (switch 4 down) and close cover.