Technical data

Installing network components in cabinets
E.2 Installed in cabinet:
PROFIBUS Network Manual
320 System Manual, Edition 04/2009, C79000-G8976-C124-03
Scope of protection
The various degrees of protection are shown and explained briefly in the following table. For
more detailed information on the individual ratings and the test conditions that must be
fulfilled, please refer to the standards listed above.
Table E- 1 Protection provided by the various IP levels (brief outline)
digit Shock hazard protection and protection against
the ingress of foreign bodies
Protection against water
1 No protection No protection
2 against foreign bodies ≥ 50 mm diameter dropping vertically
3 against foreign bodies ≥ 12 mm diameter with drops falling at 15°
4 against foreign bodies ≥ 2.5 mm diameter spay water, at an angles up to 60°
5 against foreign bodies ≥ 1 mm diameter spray water from any direction
6 Dust deposits spray water - water jet from nozzle
7 ingress of dust (dustproof) strong jet water
8 - intermittent immersion at specified
pressure for specified time
9 - permanent immersion at specified
pressure for specified time
E.2 Installed in cabinet:
Ventilation openings
The casings of most SIMATIC NET network components have ventilation openings. To allow
more effective cooling of the electronics components, ambient air can flow through the
casing. The maximum operating temperatures quoted in the technical specifications apply
only when there is unrestricted flow of air through the ventilation openings.
Depending on the size of the ventilation openings, such modules comply with degree of
protection IP 20, IP 30 to IP 40. You will find the precise degree of protection of a SIMATIC
NET component in its operating instructions.
Components with the degrees of protection mentioned above do not provide protection
against dust and water! If the installation site requires such protection, the components must
be installed in an additional enclosure such as a switching cubicle that provides the higher
degree of protection (for example IP65/ IP67).
If you install these components in an additional enclosure, make sure that the conditions
required for operation are maintained!
Heat dissipation
Make sure that the temperature inside the additional enclosure does not exceed the
permitted ambient temperature for the installed components. Select an enclosure with
adequate dimensions or use heat exchangers.