Siemens SIMATIC Box PC 820, Manual

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1-7
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
1.3 Removing and Installing Components
Prerequisites
The system unit is designed to enable any necessary maintenance work to be
carried out quickly and at low cost.
!
Warning
Please read the warnings at the front of the User’s Guide before you open the
housing of the system unit.
S
Do not open the housing unless you need to install or remove components, or
to replace the battery.
S
Write down your configuration parameters before starting the procedure.
!
Caution
Risk of damage to the unit!
Note that only qualified personnel should be allowed to work on the open unit, so the
warranty on the device is not affected. Authorized Siemens maintenance and repair
centers offer you a specialist maintenance service. The User’s Guide contains the
addresses.
!
Caution
The electronic components of the printed boards are extremely sensitive to
electrostatic discharge. When handling the boards, you must take appropriate
safety precautions. These are set out in the guidelines for electrostatically
sensitive components (ESD guidelines) in the appendix of this manual and in the
operating instructions.
Limitation of Liability
All technical specifications and licenses apply only to expansion functions
approved by Siemens. No liability can be assumed for functional constraints
caused by the use of devices and components of other manufacturers.
The following sign warns that electrostatically sensitive modules are present.
Please read the ESD guidelines.
System Unit
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