Properties of zones
You will find an overview of the zone divisions in the following table:
Table 4-1
Classification of zones - hazardous areas
Areas
Explosion hazard
Zone 2
Rare or short-term presence of potentially explosive gas atmosphere
Zone 22
1)
Rare or short-term presence of potentially explosive dust atmosphere
1)
Use the CFU only with approved housing
For additional information, refer to the Fundamentals of Explosion Protection (
support.industry.siemens.com/cs/ww/en/view/12521844
Component areas
CAUTION
Use in hazardous area of Zone 2/22
● Any CFU can be used as a bus node in Zone 2 hazardous areas.
● All CFU bundles with aluminum housing can be used as bus nodes in Zone 2 and Zone 22
hazardous areas.
Products:
– Compact Field Unit PA Bundle with Aluminum housing
– Compact Field Unit DIQ with Aluminum housing
● CFU PA: Only intrinsically safe electrical field devices of equipment category 3G and 3D
for Zone 2 and 22 may be connected to spur lines FB0 to FB7.
Read the information on approval in the product information.
The following can be used in Zone 2/22 hazardous areas:
● PROFINET cables to the CFU
● Cables to PROFIBUS PA field devices, sensors and actuators
● Intrinsically safe field devices connected to fieldbus connections FB<n> (spur line to the field
device)
● Sensors and/or actuators connected to freely configurable channels DIQ<n> (spur line to
sensor/actuator)
Intrinsic safety of the CFU PA
The CFU PA limits the energy on the fieldbus line to the intrinsically safe PA field devices, and
electrically isolates them from the live parts of the CFU PA (for example, power supply).
Fieldbus connections of the CFU PA are designed in Ex ic type of protection.
You can find additional information on intrinsic safety in the product information.
Operation planning
4.9 Use in hazardous areas
SIMATIC CFU
30
Commissioning Manual, 08/2019, A5E39252870-AD
Содержание Simatic CFU
Страница 8: ...Table of contents SIMATIC CFU 8 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 10: ...Security information SIMATIC CFU 10 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 16: ...What is a Compact Field Unit SIMATIC CFU 16 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 34: ...Operation planning 4 9 Use in hazardous areas SIMATIC CFU 34 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 46: ...Operating modes and functions 5 4 Measure frequency SIMATIC CFU 46 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 54: ...Installation 6 4 Removing the CFU SIMATIC CFU 54 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 202: ...Appendix A 10 Contact SIMATIC CFU 202 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 216: ...Glossary SIMATIC CFU 216 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 220: ...Index SIMATIC CFU 220 Commissioning Manual 08 2019 A5E39252870 AD ...