Foundation Field bus in hazardous area

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Power Supply
215mA
Supply with cable
273mA
Supply with cable and Terminators 0
Source: Dr. Ulrich Johannsmeyer, PTB 8
280mA
50 100 150 200 250 300
Ignition current in mA (including Safety Factor)
Fieldbus control system (DCS)
24Vdc 24Vdc
FISCO power supply (IIB / IIC) CONTROL ROOM
Live Maintenance !
FIELD
Intrinsically Safe Field wiring hub
Intrinsically safe FISCO Fieldbus devices
– – – – – loop resistance must be between 15 and 150ohms/km loop inductance must be between 0.4 and 1mH/km loop capacitance must be between 45 and 200nF/km maximum length of each spur cable is 60m in IIC and IIB maximum length of each trunk cable is 1km in IIC or 5km in IIB
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Fieldbus Foundation Norway Stavanger 2008
POWER SUPPLIES
Comparision of Protection Techniques used in Hazardous Area
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Fieldbus Foundation Norway Stavanger 2008
The limits are not restrictive
– typical Fieldbus cable has parameters of 50ohms/km, 0.8mH/km and 120nF/km
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Fieldbus Foundation Norway Stavanger 2008
FISCO installation
Fieldbus in hazardous areas
Fieldbus control system (DCS)
Bulk power
?
Hazardous Area protection?
Special protection for fieldbus power supply?
CONTROL ROOM
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Zone 1 Division 1
Fieldbus Foundation Norway Stavanger 2008
Multiple hazardous area trunks
Direct parallel connection on safe area side
24Vdc 24Vdc
Trunk #2
What approvals for wiring hub and junction box?
FIELD What approvals for Fieldbus devices?
Field Wiring Hub
FOUNDATION Fieldbus Devices
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Hazardous area
Fieldbus Foundation Norway Stavanger 2008
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Fieldbus Foundation Norway Stavanger 2008
Fieldbus Barrier
Fieldbus control system
Increased safety (Ex e) trunk
Power supply Singel or Redundant Up to 8 channel modules available CONTROL ROOM
Min. 9V Min. 10mA Typical 12-16 devices.
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Tx @ 14 mA Pos @ 22mA
Fieldbus Foundation Norway Stavanger 2008
FF Basic Information
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Fieldbus Foundation Norway Stavanger 2008
Zone 1 Division 1
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Fieldbus Foundation Norway Stavanger 2008
FB Fieldbus Barriers: Exe/Exi concept
Galvanic isolation and IS “barrier” in the field. Ex-e trunk with higher current available Zone-1 mountable fieldbus wiring hub for Intrinsically safe fieldbus devices Supports FISCO and „Entity‟ field devices
Fieldbus control system (DCS)
FF Power Supply
31,25 Kbit/s 32 Address 12 dev. @ 1s scan
Trunk
CONTROL ROOM
FIELD
Field wiring hub
w. Short circuit protect.
Spur
FISCO
265mA 60m

80mA 120m
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Fieldbus Foundation Norway Stavanger 2008
FISCO vs. Fieldbus Barrier
FISCO
IS Spur? Live Maintenance? IS Trunk? Live Maintenance? Simple documentation? Redundant Power Redundant Field Wiring Hub Compatible with FISCO field devices? Compatible with Entity field devices?
Trunk #3
Intrinsically safe FISCO Fieldbus devices
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Zone 1 Division 1
Fieldbus Foundation Norway Stavanger 2008
Redundant FISCO architecture
Bulk power input
„Entity‟ IS vs. FISCO
Entity IS
Intrinsically safe trunk and spurs? „Live-working „ permitted in any part of field network? Simple safety documentation? Eliminate cable parameter calculations? Gas Group IIB option? Max output current Max spur length
FIELD
ENTITY certified devices!
Field Wiring Hub
Max 4 Fieldbu devices!
FOUNDATION Fieldbus Devices
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Haation Norway Stavanger 2008
FOUNDATIONTM Fieldbus in Hazardous Areas
Physical Layer Concept
Einar S. Huse NOREX / MTL
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Fieldbus Foundation Norway Stavanger 2008
FF Basic Information
FIELD
Fieldbus Barriers
IS spurs
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Intrinsically safe Fieldbus Devices
Fieldbus Foundation Norway Stavanger 2008
Fieldbus Barrier across Zones
HOST / LAS
Power Supply
CONTROL ROOM Ex-e Field Wiring Hub
FIELD
No live maintenance!
Ex-d / Ex-e Instruments
FOUNDATION Fieldbus Devices
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Hazardous area
Fieldbus Foundation Norway Stavanger 2008
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Fieldbus Foundation Norway Stavanger 2008
More field devices with FISCO
80mA available, typically 3 - 4 devices Entity, IIC/IIB Gas Groups 120mA available, (140mA) typically 6-8 devices FISCO, IIC Gas Groups 265mA available, (280 mA) typically 14-16 devices FISCO, IIB Gas Groups
Methods of protection