Brochure

ET 200 - characteristics 15
Use in hazardous areas
In many industries, the manufacture, processing, trans-
port or storage of combustible materials results in the cre-
ation or release of gases, vapors or mist into the
environment. Other processes create combustible dust. In
combination with oxygen in the air, a potentially explosive
atmosphere can occur that will result in an explosion if ig-
nited. Special properties must be exhibited by the equip-
ment used in these environments, and they must be
certified.
SIMATIC ET 200 is equipped for this, and includes a corre-
sponding range of products.
The ET 200 systems can be used in different zones – either in
Zones 2 and 1 in the case of gaseous atmospheres, or in Zones
22 and 21 in the case of dusty atmospheres.
The sensors and actuators linked to the I/Os can even be in
Zone 0 or Zone 20.
A manufacturer's declaration (compliance of the control cabi-
net with the ATEX directive) is necessary for installation in
Zone 2/22. Certification of the control cabinet for the gas/dust
area must be procured for installation in Zone 1/21.
Data communication takes place as usual over PROFIBUS. If
communication is continued over PROFIBUS stations in Zone
1 or for other reasons over intrinsically safe PROFIBUS stations,
the PROFIBUS is made intrinsically safe by an intermediate
fieldbus isolating transformer. This limits the ignition energy
to the permissible level and the intrinsically safe PROFIBUS is
routed to the hazardous area.
ET 200 in hazardous gas and dust atmospheres
1)
Gas atmosphere: Installation of the components always in an enclosure in
Zone 2 in degree of protection IP5x and in Zone 1 in an Ex e enclosure.
Dust atmosphere: Installation of the components always in an enclosure in
Zone 22 with IP5x degree of protection and in Zone 21 with IP6x degree or
protection.
2)
With 10 A DC standard power supply
3)
Installation of the station complies with FM/UL up to Class I, Division 2; con-
nected sensors and actuators even up to Class I, Division 1 or installation of
station and sensors/actuators according to FM/UL up to Class II/III, Division 1
012
Ex isolating
transformer
DUST
Hazardous area
Actuators/
sensors
Actuators/
sensors
Actuators/
sensors
Actuators/
sensors
Zone 22 Zone 21 Zone 20
Class II Zone 0Class II Zone 1Class II Zone 2
Actuators/
sensors
Fieldbus
isolating transformer
Control system
Class I Zone 0Class I Zone 1Class I Zone 2
Zone 0Zone 1Zone 2
G_ST70_XX_00674
PROFIBUS DP-iS
HART
HART
FM/UL
ATEX
ATEX
FM/UL
ET 200S
S7-400
ET 200M
DP/PA-
Link
PROFIBUS PA
SITRANS P AFDiS
SITRANS F
ET 200iSP
1) 3)
Ex i
2)
1)
1)
1)
1)
Industrial Ethernet
Ex i, Ex e
SIMATIC_ET200_ENGLISCH.book Seite 15 Montag, 26. November 2012 10:02 10
© Siemens AG 2012