Foundation Field Bus ( MU-Final)
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Transcript of Foundation Field Bus ( MU-Final)
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In the name of Allah the most beneficent the most
merciful
MID COUNTRY REFINERYINSTRUMENTATION
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It Is Much More than a
Digital Communication Protocol!
Foundation Fieldbus
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Foundation Fieldbusis a bidirectional digitalcommunications networkthat is being used in
industry to replace the existing standard (4-20 mA
analog signal).
Foundation Fieldbus
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Characteristics of Fieldbus networks
Foundation Fieldbus works on Tree or StarTopology network structures with token
passing methodology.
Bi-direct ionalmeans it is a duplex port; thedata can be transmitted in two directions atthe same time.
Mult i -dropis also referred to as multi-accessand it can be interpreted as a single bus withmany nodes connected to it.
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LAS Fieldbus
The link active scheduler (LAS) is the heartbeat of a FoundationFieldbus segment. It grants permission for every
communication that occurs on the bus.
The Fieldbus segment includes a single twisted-wire pair toconnect up to 32 devices, including field instruments and hostcomputers.
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LAS Fieldbus
one device can use the bus at a time, proper
scheduling is important for good process control.
Each instrument must be given time to
communicate control data, alarms, instrument
stored trends, events, and other information
necessary to maintain bus operation .
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HART FOUNDATION FIELDBUS
In HART devices, this data is
delivered via digital signaling
that is superimposed on topof the traditional 4-20 ma
current loop used to return (or
send) the process variable (PV).
Communication speed forHART signaling is 1.2 kbps.
Foundation Fieldbus is 100%
digital Bidirectional
communication with Fielddevices ( instruments) .
Communication speed for
Fieldbus signaling is 31.25kbps.
Comparing HART and Foundation Fieldbus
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DCS with FF Capability
Proprietary Functionality and
Control Function
Proprietary and DedicatedSoftware
Proprietary and Dedicated
Network
(Proprietary Layer + TCP/IP + Ethernet)
4-20 ma Devices
Fieldbus H1 Network (31.25 Kbps)
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Foundation Fieldbus Communication Protocol
The FOUNDATION Fieldbus H1 communication signal
is a square waveform superimposed on a DC carrier.
The frequency of the signal is 31.25 KHz.
The voltage range allowed for proper operation is 9 to
32 VDC. A typical Fieldbus device will consume 20 mA
of current.
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Fieldbus Cable Specifications
The specifications for Fieldbus H1 physical media are
defined by IEC 61158-2 and the ISA-S50.02 Part 2
Physical Layer.
Standards. The same standard is also listed in the
FOUNDATION Fieldbus specifications under 31.25 Kbps
Physical Layer Profile FF-816-1.4.
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Fieldbus Cable Specifications
Type A Shielded, Twisted Pair 18 AWG 1900 m (6232 ft.)Type B Shielded, Multi Twisted Pair 22 AWG 1200 m (3936 ft.)
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Termination
FT-100
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FCV-100
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TT-100
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Field
PT-101
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Junction Box
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Marsh Cab.
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I.S.
Barrier
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I/O
Assembly
Conventional analog termination
Fieldbus termination (also included
in conventional termination count)
4 pr 4 pr4 pr
1 pr 1 pr 1 pr
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Fieldbus Wiring Validator FBT-5
Fieldbus wiring can be tested using the FBT-5 Wiring
Validator. It puts a DC voltage and Fieldbus signals on
the wire pair. A Fieldbus Monitor, FBT-3 or FBT-6, is
used to test the voltage, signal levels and noise on the
wiring.
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Industrial Application of Fieldbus
http://www.findarticles.com/p/articles/mi_qa3829/is_200502/ai_n11849534http://www.bechtel.com/Briefs/0704/CSPC.htm -
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Field Bus Technologys Vendor
http://www.topworx.com/fn_ff.htmlhttp://www.stdauto.com/dc_fb_solutions.shtmlhttp://www.smar.com/fieldbus.asphttp://www.ni.com/fieldbus/http://content.honeywell.com/imchttp://www.endress.com/ProcessSolutionshttp://easydeltav.com/keytechnologies/fieldbus/http://www.dekoroncable.com/http://www.belden.com/http://www.abb.com/fieldbus -
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