Siemens Simatic PC Panel PC 870 Service Manual download pdf (Page 42)

Maintenance

4-4

SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual

Edition 07/02

4.2.2 Panel PC 870

Proceed as follows:

1. Disconnect the power supply.

2. Swing open the mounting panel to obtain access to the rear of the PC

870.

3. Loosen the four (retained) knurled screws which secure the computing

unit to the rear side of the operating unit (see also Figure 3–3).

4. 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.

Operating unit

Clips acting as hinges

Computing unit

Computing unit,

swung away by 90_

Knurled screw

Fig. 4-3 Swinging the computing unit away from the operating unit (viewed from above)

5. Remove the cable connectors K1 and K2 of the operating unit (see Fi-

gure 4-4) from their corresponding counterparts on the computing unit.

6. Lift the computing unit off the hinges of the operating unit and place it

down carefully.

If necessary, you can now remove the operating unit by loosening

either the screws or, depending on the version, the six clamps which

secure the operating unit to the mounting panel (see Figure 3-3).

Removing the

computing unit

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Siemens Simatic PC Panel PC 870 Service Manual Page 42