Practical Use and Understanding of Foundation Fieldbus for Engineers and Technicians
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Transcript of Practical Use and Understanding of Foundation Fieldbus for Engineers and Technicians
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Practical Use and Understanding of Foundation Fieldbus for Engineers & Technicians
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FieldBus• A number of competing standards worldwide
• No internationally agreed standard which the market has completely accepted
• All standards based on the OSI Model
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Existing Plant Scenario
Control Room Bus
Plant Bus
PlantInterface& Local
Controllers
TerminalBoxes
Plant
Instrument Room
Central Control Room
From OtherInstrument
Rooms
P T
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Existing 4-20mA to Fieldbus
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New FieldBus Approach
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Soft PLC System
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What is FieldBus?• A smart instrument based system• Digital data communications• An internationally and market accepted standard to
effectively replace the ‘old’ 4-20mA standard
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Real Benefits• Greatly reduced wiring costs
• Reduced installation and start-up time
• Improved on-line monitoring and diagnostics
• Easier change-out and expansion of devices
• Improved local intelligence in the devices
• Improved interoperability between manufacturers
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Competing Requirements• A single bus system seems to be technically
possible...
but what happens if the bus fails?
• Simple field devices require simple ON/OFF status and are real time (m.secs response)
• PLC’s to SCADA systems require large messages and update times of 10-100 m.secs
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Three Network Classes• Bit (Sensor)
• Byte (Device)
• Message (Field)
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Sensorbus
• Seriplex• ASI• INTERBUSLoop
Devicebus
• Device Net• SDS• Profibus DP• LONWorks• INTERBUS-S
Fieldbus
• IEC/ISA SP50• Fieldbus Foundation• Profibus PA• HART
Type ofDevices
Type ofControl
Another way of looking at the industrial networks:
ProcessControl
LogicControl
Low-endbit
Midrangebyte
High-endblock
Simple Devices Complex Devices©Smar
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Bit Oriented Systems
• Binary type switches such as Proximity sensors/contact closures/float switches
• Example: Actuator Sensor Interface (ASI)
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Byte Oriented Systems
• Byte oriented systems such as bar code readers, temperature and pressure transmitters
• Excellent Examples:
• DeviceNet or CANBUS
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Message Oriented Systems• Message oriented systems - PC’s to PLC’s in
uploading system or device configuration information
• Messages greater than 16 bytes in length
• Examples:
• Interbus-S; Profibus; Foundation Fieldbus
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