Siemens SIMATIC S5 Manual page 6

The diagram below shows the required protective measures against electrostatic discharge.
Standing position
Q n
b
e
a
\
Sitting position
Measurements on modules may only be earned out under the following conditions:
The measuring equipment is grounded (e.g. via the PE conductor of the power supply
system) or
when electrically isolated measuring equipment is used, the probe must be discharged
(e.g. by touching the metallic casing of the equipment) before beginning measurements.
Only grounded soldering irons may be used.
6 Shipping of ESt) Modules
Anti-static packing material must always be used for modules and components, e.g. metalized
plastic boxes, metal boxes, etc. for storing and dispatch of modules and components.
If the container itself is not conductive, the modules must be wrapped in a conductive material
such as conductive foam, anti-static plastic bag, alummium foil or paper. Normal
foils should not be used under any circumstances.
For modules with built-in batteries ensure that the conductive packing does not touch or short-
circuit the battery connections; if necessary cover the connections with
material.
Standing/sitting position
d
a
b
c
d
f
e
f
r
c
a
\
Conductive flccmng
Grounding wrist strap
Grounding common of the cabinets
bags or
tape or
3