Practical Use and Understanding of Foundation Fieldbus for Engineers and Technicians

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Foundation Fieldbus (FF) is one of the leading fieldbuses in Process Automation. Its sophisticated architecture is tailor-made for today's automation systems. Its unique set of features allows for the implementation of true distributed control. The Foundation Fieldbus includes an H1 protocol based on IEC 61158-2 physical layer specification as well as an HSE standard for communication over Ethernet/IP. These features and the possibility for distributed control make the Foundation Fieldbus unique for process control application. The main aim of this workshop is to give you a clear understanding of Foundation Fieldbus and to enable you to specify and design systems using this technology. There has been a surge of interest in Foundation Fieldbus due to the tremendous benefits it provides. This workshop aims to break down the terminology and jargon barriers and to explain Foundation Fieldbus in a simple and understandable way; thus enabling you to apply the technology effectively. more infor

Engineering

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
Central Control Room
Control Room Bus
Plant Bus
Plant
Interface
& Local
Controllers
Instrument Room
Terminal
Boxes
Plant
From Other
Instrument
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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Another way of looking at the industrial networks:
Sensorbus
• Seriplex
• ASI
• INTERBUSLoop
Devicebus
• Device Net
• SDS
• Profibus DP
• LONWorks
• INTERBUS-S
Fieldbus
• IEC/ISA SP50
• Fieldbus Foundation
• Profibus PA
• HART
Type of
Devices
Type of
Control
Process
Control
Logic
Control
Low-end
bit
Midrange
byte
High-end
block
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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DO YOU WANT TO KNOW MORE?
If you are interested in further training or
information, please visit:
http://idc-online.com/slideshare
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The document discusses Foundation Fieldbus, an open standard for process automation communication. It was established by the International Society of Automation to create a single international fieldbus standard. Foundation Fieldbus uses digital, serial communication between intelligent field devices. It provides wiring and installation savings, enhanced data availability, improved user interfaces, and interoperability between devices.

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Fieldbus is a digital communication network that replaces the existing 4-20 mA analog standard. It uses a bi-directional, multi-drop, serial-bus network to connect field devices like sensors, actuators, and controllers. Foundation fieldbus is an open architecture that uses digital communication over two wire pairs to connect intelligent field devices and distribute control applications across the network. It provides benefits like reduced wiring, self-diagnostics, improved control capability, and integration with information systems. While fieldbus offers advantages in cost savings and performance, it also has some disadvantages like increased complexity, higher component costs, and risks around standards.

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Fieldbus is a family of industrial network protocols that allows multiple instruments to communicate over a single cable for distributed real-time control. It uses significantly less wiring than traditional 4-20mA systems. A Fieldbus network consists of a trunk that carries power and digital signals to connect up to 32 field devices. It requires terminators at each end and device couplers. Fieldbus provides benefits like reduced wiring and space in control rooms which lowers capital and operating expenses. It also enables easier commissioning and maintenance.

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A device that can transmit and receive messages. - Assistants can initiate transmissions. - They are usually field devices like transmitters and valves. - They have a unique network address. - They can be scheduled to transmit by the LAS. - They can also transmit spontaneously if needed. - They can receive messages addressed to them. - They can receive broadcast messages. - They can receive messages from the LAS. - They can request the LAS for transmission opportunities. - They can acknowledge messages. - They can respond to polls from other devices. - They can participate in the bus arbitration process. - They can detect and

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