Maintenance and service
8.3 Separating the control unit from the computer unit
SIMATIC PC Panel PC 677/877, Control Unit
Operating Instructions, Edition 04/2005, A5E00407724-01
8-3
Figure 8-1
Separating the control unit from the computer unit
4. Swing the computer unit (1) away. The connectors on the back of the control unit (3) are
now accessible.
5. In order to dismount the computer unit, loosen cabels K1 to Kx and the USB cable
between the computer unit and the control unit.
6. The computer unit is hooked to the control unit with the lugs (5). Lift the computer unit
vertically off the control unit.
Note
The lugs (4) only connect the control unit to the processing unit for Panel PC 877.
7. Put the computer unit down carefully.
8. Where necessary, also remove the control unit depending on its design: Secure the
control unit against falling out and unscrew it. Or remove the clamps which secure the
control unit to the installation wall, as shown in the installation cut-out in the dimensions
diagram.