abhfi (ics) field bus

8/10/2019 Abhfi (Ics) Field Bus

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ABHFEETH K A


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What is a Fieldbus?A Fieldbus is an industrial computer

network for real-time distributed control.

Human Machine Interface (HMI)at the top,Programmable Logic Controllers (PLCs)inthe middle, and the Fieldbusat the bottom.

The Fieldbus links the PLCs to the

components which actually do the worksuch as sensors, actuators, electric motors,switches, valves, and contactors.


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Fieldbusreplaces the existing 4-20 mAanalog signal standard.

The network is a digital, bi-directional,multi-drop, serial-bus communicationnetwork.Bi-directional the data can be

transmitted in two directions at the sametime.

Multi-dropis a single bus with manynodes connected to it.Serial-busthe data is transmitted serially

according to RS232 or RS485 protocol.


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History & Current State In 1999 a committee formed the IEC 61158

standard with eight different protocol sets:

FOUNDATION

Fieldbus H1

ControlNet

PROFIBUS

P-Net

FOUNDATION

Fieldbus HSE

Interbus

SwiftNet

WorldFIP


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Where are Fieldbuses Used? In complex

automatedindustrial systemswhere an organizedhierarchy ofcontroller systems isneeded.

In manufacturingplants where manyinstruments need tobe connected.


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What are Fieldbuses Used For?When fieldbuses work in the factory, the

purpose has been to reduce installation cost

by moving the I/O interface from theprogrammable logic controller (PLC) to aremote I/O unit mounted close to the

machine on the factory floor.


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Advantages of FieldbusA major advantage of fieldbus is the capital

expenditure savings associated with cable

elimination; multiple devices share wire-pairs inorder to communicate over the bus network andsavings are also available through speediercommissioning.

Ongoing maintenance and process control systemperformance are significantly enhanced throughfieldbus systems, which results in operationsexpense savings .


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Disadvantages of Fieldbus Disadvantages of fieldbus compared to the 4-20 mA analog

signal standard:

Fieldbus systems are complex, so more training needed

The price of fieldbus components is higher Fieldbus test devices are more complex

Device manufacturers have to offer different versions ofdevices due to different fieldbus standards. This can add

to the cost of the devices and increases the difficultly ofdevice selection.

Standards may predominate or become obsolete,increasing the investment risk.


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Use in Industry Fieldbus continues to be an important element of

the automation industry. InTechmagazine

conducted a Market Study 80% of manufacturing facilities use fieldbus

Manufacturers use more than one fieldbusprotocol in their process

Fieldbus connected to the Internet?No - 82%, Yes - 18%

abhfi (ics) field bus

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