4 Wiring Proline Prowirl 72 FOUNDATION Fieldbus
24 Endress + Hauser
4. 3 Connecting the measuring unit
Field instruments can be connected to the FOUNDATION Fieldbus in two ways:
• Connection via conventional cable gland Kap. 4.2.1
• Connection via prefabricated fieldbus connector (option) Kap. 4.3.2
4.3.1 Connecting the transmitter
!
Note!
• When connecting Ex-certified devices, please refer to the notes and diagrams in the Ex-specific
supplement to these Operating Instructions.
• The remote version must be grounded. In doing so, the sensor and transmitter must be connected
to the same potential matching.
• The national regulations governing the installation of electrical equipment must be observed.
• When connecting the transmitter, use a connecting cable with a continuous service temperature
of at least –40 °C (–40 °F) to permitted max. ambient temperature plus 10 °C (plus 18 °F).
• A shielded cable must be used for the connection.
• The terminals for the FOUNDATION Fieldbus connection (terminal 1 = FF+ , terminal 2 = FF –)
have integrated reverse polarity protection.
This ensures correct signal transmission via the fieldbus even if lines are confused.
• Cable cross-section: max. 2.5 mm²
• Observe the grounding concept of the plant.
"
Caution!
• Risk of damaging the fieldbus cable!
If the shielding of the cable is grounded at more than one point in systems without additional
potential matching, mains frequency equalizing currents can occur that damage the cable or the
shielding. In such cases, the shielding of the cable is to be grounded on only one side, i.e. it must
not be connected to the ground terminal of the housing. The shield that is not connected should
be insulated!
• We recommend that the fieldbus not be looped using conventional cable glands. If you later
replace even just one measuring device, the bus communication will have to be interrupted.
• Please pay particular attention to company-internal grounding concepts and national installation
regulations and guidelines.
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