4
4-2
Programming Device PG 740
C79000-G7076-C742-01
4.1
Opening the Unit
The programming device is designed to enable any necessary maintenance
work to be carried out quickly and at low cost.
!
Caution
The electronic components of the printed-circuit boards are extremely
sensitive to electrostatic discharge. When handling the boards, you must
follow the guidelines for electrostatically sensitive components (ESD
guidelines) at the end of this book.
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.
All modules and components in the PG 740 are electrostatically sensitive.
Please read the ESD guidelines at the end of this book carefully. The
following sign on cabinets, module racks or packaging warns that
electrostatically sensitive modules are present.
The following rules are mandatory when carrying out any work on the open
unit, and should be read carefully before opening the unit:
S
Before you disconnect the power supply cable, discharge any electrostatic
charge on your body. You can do this by touching metallic parts, such as
screws, on the rear panel of the PG 740.
S
Discharge any electrostatic charge from tools that you are using.
S
Wear a grounding wrist strap if you are handling components.
S
Leave components and modules in their packing until you are ready to
install them.
S
Disconnect the PG 740 from its power supply before plugging in or
removing any modules or components.
S
Touch components and modules only on their edges. Above all, do not
touch the connecting pins and printed conductors.
S
Do not operate the PG 740 with the cover open.
Prerequisites
Limitation of
Liability
Before Opening
the Unit
PG 740 Expansions
