Inhaltsverzeichnis
Werbung
Verfügbare Sprachen
Verfügbare Sprachen
FOUNDATION Fieldbus temperature transmitter
Installation
4
Endress+Hauser
3.2
Installation
The unit can be fitted directly to a sensor or a mounting bracket.
Fig. 3-1: Field transmitter dimensions in mm (inch)
4
Wiring
Warning!
When connecting Ex-certified devices, see the notes and diagrams in the Ex-specific
supplement to this operating manual. Please do not hesitate to contact your E+H
representative if you have any questions.
4.1
Cable specifications for fieldbus
Cable type
Twin-core cable is recommended for connecting the flowmeter to the FOUNDATION
Fieldbus H1. By analogy with IEC 61158-2 protocol four different cable types (A, B, C,
D) can be used with the FOUNDATION Fieldbus Protocol, only two of which (cable types
A and B) are shielded.
• Cable types A or B are particularly preferable for new installations. Only these types
have cable shielding that guarantees adequate protection from electromagnetic inter-
ference and thus the most reliable data transfer. With cable type B more than one field-
bus (with the same degree of protection) may be operated in a cable. No other circuits
are permissible in the same cable.
• Practical experience has shown that cable types C and D should not be used due to
the lack of shielding, since the freedom from interference generally does not meet the
requirements described in the standard.
The electrical data of the fieldbus cable has not been specified but determines
important characteristics of the design of the fieldbus, such as distances bridged,
number of participants, electromagnetic compatibility etc.
4 Wiring
87
Werbung
Kapitel
Inhaltsverzeichnis
Fehlerbehebung
