Siemens SCALANCE X-200 Series Compact Operating Instructions page 71

One particular advantage of the SCALANCE X-200IRT switches in PROFINET networks is
the integrated ERTEC. This gives priority to PROFINET packets when forwarding.
When used under hazardous conditions (zone 2), the devices of the SCALANCE X-100 and
SCALANCE X-200 product lines must be installed in an enclosure.
To comply with ATEX95 (EN 60079-15), this enclosure must meet the requirements of at
least IP54 in compliance with EN 60529.
WARNING – EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT WHEN A
FLAMMABLE OR COMBUSTIBLE ATMOSPHERE IS PRESENT.
Note
The specified approvals apply only when the corresponding mark is printed on the product.
SCALANCE X-200
Compact Operating Instructions, 12/2010, A5E00813159-11
WARNING
Description
3.4 Introduction
71