Siemens PC 870 - Manual (Page 34)

Maintenance
4-2
SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual
Edition 07/01
4.2 Detaching the operating unit from the computing unit
It may at some stage become necessary to separate the operating unit
from the computing unit, e.g. to replace the operating unit.
4.2.1 Panel PC 670
To swing the computing unit away from the operating unit, proceed as
follows:
1. Undo the knurled screws which secure the computing unit to the
rear side of the operating unit.
2. Swing the computing unit away to the left, whereby the two left clips
act as hinges and thus prevent an unintentional releasing of the
computing unit:
Mounting rail
Computing
unit swung away by 90
°
Computing unit
Clips
Mounting rail
Compu-
ting unit
Opera-
ting unit
Fig. 4-1 Swinging the computing unit away from the operating unit (viewed from above)
You can now access the connections on the rear panel of the operating
unit.
Swinging open the
computing unit