7
Functional Description of the Fieldbus Modules
7-14
7.2.3.1
Transmission technology
Data transfer from the fieldbus module to the fieldbus devices is possible in two ways,
conforming to the standards:
•
RS485 transmission
•
Transmission via fiber-optic cables (FO cables) with the appropriate converters
from another supplier, for RS485
➩
FO cable and FO cable
➩
RS485 transition.
Both transmission techniques provide for reliable long distance transmission with a
high transmission rate, and simple electromechanical parts. A shielded TP (twisted-
pair) copper cable is the hardware required for RS485 transmission. It connects all
devices to the bus structure (line).The bus structure allows for non-reactive coupling
and decoupling of stations or stepwise commissioning of a system. Later extensions
have no impact on stations that are already working on the bus.
Up to 32 nodes (masters and slaves) can be grouped in a single segment. When
using more than 32 nodes, several segments linked to each other through repeaters
(power amplifiers) are needed. A maximum of 127 nodes can be connected to a
Profibus DP line in this way. The max. line length depends on the transmission rate.
The specified length can be increased when using repeaters. Note that it is
recommended to use not more than three series-connected repeaters on a line.
Every bus segment is terminated
at each end through an active
bus termination.
If the Profibus module is located
at the end of a line, make sure
that the bus termination, which
may be connected into the line,
is
available
in
the
Profibus
connector.
Fig. 7-5
FI 830F bus termination
To ensure trouble-free operation, make sure that the two bus terminations are always
under power.
Summary of Contents for AC 800F
Page 1: ... PROCESS AUTOMATION Freelance 2019 Mounting and Installation Instructions AC 800F Controller ...
Page 2: ......
Page 66: ...3 Mounting the AC 800F 3 38 ...
Page 168: ...4 Cabling the AC 800F 4 102 ...
Page 290: ...7 Functional Description of the Fieldbus Modules 7 36 ...
Page 317: ...10 Approvals certificates 10 1 10 Approvals certificates 10 1 ISO 9001 Fig 10 1 ISO 9001 ...
Page 318: ...10 Approvals certificates 10 2 Fig 10 2 ISO 9001 ...
Page 319: ...10 Approvals certificates 10 3 Fig 10 3 ISO 9001 ...
Page 320: ...10 Approvals certificates 10 4 Fig 10 4 ISO 9001 ...
Page 321: ...10 Approvals certificates 10 5 10 2 ISO 9000 Fig 10 5 ISO 9000 ...
Page 322: ...10 Approvals certificates 10 6 Fig 10 6 ISO 9000 ...
Page 323: ...10 Approvals certificates 10 7 10 3 CE Fig 10 7 CE certificate page 1 ...
Page 324: ...10 Approvals certificates 10 8 Fig 10 8 CE certificate page 2 ...
Page 325: ...10 Approvals certificates 10 9 Fig 10 9 CE certificate page 3 ...
Page 326: ...10 Approvals certificates 10 10 Fig 10 10CE certificate supplement ...
Page 327: ...10 Approvals certificates 10 11 10 4 CSA Fig 10 11 CSA certificate page 1 ...
Page 328: ...10 Approvals certificates 10 12 Fig 10 12 CSA certificate page 2 ...
Page 329: ...10 Approvals certificates 10 13 Fig 10 13 CSA certificate page 3 ...
Page 330: ...10 Approvals certificates 10 14 Fig 10 14 CSA certificate page 4 ...
Page 331: ...10 Approvals certificates 10 15 10 5 UL Fig 10 15 UL certificate ...
Page 332: ...10 Approvals certificates 10 16 Fig 10 16 UL certificate page 2 ...
Page 333: ...10 Approvals certificates 10 17 Fig 10 17 UL certificate page 3 ...
Page 334: ...10 Approvals certificates 10 18 Fig 10 18 UL certificate page 4 ...
Page 335: ...10 Approvals certificates 10 19 10 6 GUS certificate Fig 10 19 GUS certificate ...
Page 369: ...13 Glossary 13 18 Component of the Freelance 2000 System ...
Page 378: ......