Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual page 32

Installation
Installation location
The DP/PA coupler Ex [i] or the DP/PA link with DP/PA couplers Ex [i] can be
operated in potentially explosive areas classified as Zone 2 if they are installed in a
suitable housing. The bus cable for PROFIBUS-PA may be extended out of the
potentially explosive area into Zone 0.
Housing for Zone 2
The DP/PA coupler Ex [i] or the DP/PA link with DP/PA couplers Ex [i] must be
mounted in a housing with the IP 54 degree of protection. The housing must be
accompanied by a manufacturer's declaration for Zone 2 (in accordance with
EN 50021).
Use the following cable fittings:
S Power supply and PROFIBUS-DP Ex i: Cable fitting with manufacturer's
declaration for Zone 2
S PROFIBUS-PA Ex i: Type of protection EEx i
Danger
!
Under certain circumstances, ignitable sparks or inadmissible surface
temperatures may occur.
Never install the equipment under explosive conditions!
3-2
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1