Siemens SIMATIC S5 TD 390 Manuel page 108

Tables and Technical Data
Handling of ESD Modules
One basic rule to be observed is that electronic modules should be
touched by hand only if this is necessary for any work to be done on
them. Do not touch the component pins or the conductor.
Touch components only if
– the person is grounded at all times by means of a wrist strap, or
– the person is wearing special anti-static shoes or shoes with a
grounding strip.
Before touching an electronic module, the person concerned must
ensure that (s)he is not carrying any static charge. The simplest way
is to touch a conductive, grounded item of equipment (e.g. a blank
metallic cabinet part, water pipe, etc.) before touching the module.
Modules should not be brought into contact with insulating materials
or materials which take up a static charge, e.g. plastic foil, insulating
table tops, synthetic clothing, etc.
Modules should only be placed on conductive surfaces (table with
anti-static table top, conductive foam material, anti-static plastic bag,
anti-static transport container).
Modules should not be placed in the vicinity of visual display units,
monitors or TV sets (minimum distance from screen > 10 cm).
A-6
TD 390
C79000–A8576–C292–01