Opening The Unit - Siemens SIMATIC PG 720 P Manual

PG 720 Expansions
5.1

Opening the Unit

Prerequisites
The device is designed for easy maintenance so that any work that is
necessary can be done quickly and at low cost.
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 handling electrostatically-sensitive devices at
the end of this manual.
Limitation of All technical specifications and licences apply only to expansion functions
Liability approved by SIEMENS.
No liability can be accepted for impairment of functions caused by the use of
devices and components of other manufacturers.
All the modules and components in the PG 720 are electrostatically sensitive.
Please read the ESD guidelines at the end of this book carefully. The
following symbol warns that electrostatically-sensitive modules are present.
Before Opening Note the following rules before opening the unit:
the Unit
Tools
Use a screwdriver to open the unit.
5-2
Before you disconnect the power supply cable, discharge any electrostatic
charge on your body. You can do this by touching the metal mounting
plate for the interfaces on the left-hand side panel of the unit.
Discharge any electrostatic charge from tools that you are using.
Wear a grounding wrist-strap if you are handling components.
Leave components and modules in their packing until you are ready to
install them.
Disconnect the PG 720 from its power supply and remove the battery
before plugging in or removing any modules or components.
Touch components and modules only on their edges. Above all, do not
touch the connecting pins and printed conductors.
Never operate the PG 720 with the cover open.
PG 720 P Programming Device
C79000-G7076-C721-02