Siemens PC 870 manual Detaching the operating unit from the computing unit, Panel PC

Maintenance

4.2Detaching 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.

4.2.1Panel PC 670

Swinging open the	To swing the computing unit away from the operating unit, proceed as
computing unit	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:

Clips	90°
Mounting rail	Computing unit swung away by
Computing unit
Compu-
ting unit
Mounting rail
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.

4-2	SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual
	Edition 07/01