Siemens Simatic PC Panel PC 870, Equipment Manual

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Servicing and Expanding the Computing Unit Release 11/02
4-2
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
4.1 Opening the Device
4.1.1 Requirements
The device is designed for easy maintenance so that any work that may be
necessary can be done quickly and economically.
Caution
The electronic components on the printed circuit boards are extremely sensitive to
electrostatic discharge. Certain precautionary measures are therefore necessary
when handling such components. These measures are explained in the guidelines
for electrostatic sensitive devices at the end of this manual (ESD Guidelines).
Limitation of liability
All technical specifications and approvals only apply to expansion modules
approved by SIEMENS.
No liability can be accepted for impairment of functions caused by the use of
non-Siemens devices or non-Siemens components.
All the modules and components are electrostatically sensitive. Please study the
notes on electrostatic sensitive devices (see Appendix). The following symbol
indicates that electrostatically sensitive modules are present.
Tools
You can perform all necessary installation work on the computer unit with
screwdrivers of the type TORX T10 and TORX T8.
Before opening the device
Note the following rules before opening the device:
S
Before you disconnect the power supply cable, discharge the electrostatic
charge on your body. You can do this by briefly touching the mounting plate for
the interfaces on the left side of the device.
S
Discharge the electrostatic charge from tools you are using.
S
Wear a grounding strap when handling components.