The document discusses the HART communication protocol, which defines a standard for sending and receiving digital information across analog wires between smart field devices and host systems. It describes how HART works by superimposing digital signals on top of the standard 4-20mA analog signal, allowing bidirectional communication at 1200 bits per second without interrupting the analog signal. Benefits of HART include access to device parameters and diagnostics, compatibility with existing equipment, and open interoperable standards.

1. MIET
GONDIA
Department of electronics & comm.
HART Communication
Guided by:-
Prof. Shekhar Patle
Submitted by:-
Punam Tembhare

2.  Introduction
 What is HART?
 How HART Works?
 Features of HART technology .
 HART Communication Protocol
 HART technology can help in:
 Two Communication Channels.
 Benefits of Using HART .
 Application
 References

3.  HART® Field Communications Protocol is widely recognized
as the industry standard for digitally enhanced 4-20 mA smart
instrument communication. Use of the technology is growing
rapidly, and today virtually all major global instrumentation
suppliers offer products with HART communication.
 The HART Communication Protocol (HART = Highway
Addressable Remote Transducer) defines a bi-directional field
communication protocol standard for instrument, control and
automation systems. Actually, it's not just a standard, but the
global standard for sending and receiving digital information
across analog wires between smart devices and host systems.
A host can be any software application from technician's
hand-held device or laptop to a plant's process control, asset
management, safety or other system using any control
platform.

4.  HART (“Highway Addressable Remote Transducer”) is a
communication protocol designed for industrial process
measurement and control application.
 It is called a hybrid protocol because it combine digital and
analog communication
 The digital signal does not affect the analog reading.

5.  “HART” is an acronym for Highway Addressable Remote Transducer. The
HART Protocol makes use of the Bell 202 Frequency Shift Keying (FSK)
standard to superimpose digital communication signals at a low level on top
of the 4-20mA.
 The HART protocol communicates at 1200 bits per second without
interrupting the 4-20 mA signal and allows a host application to get two
or more physical updates per second from a smart field device.
 This is the diagram of frequency shift keying[FSK].

6.  Compatibility with standard 4-20mA wiring
 Simultaneous transmission of digital data
 Simplicity through intuitive menu-driven interfaces
 Risk reduction through a highly accurate and robust
protocol
 Ease of implementation for maximum “up-front”
cost effectiveness
 Broad product selection, with compatible devices
and software applications from most process
automation providers
 Platform independence for full interoperability in
multi-vendor environments

7.  The HART (Highway Addressable Remote Transducer) protocol is a
widely accepted standard for digitally enhanced communication with
instrumentation within the process industries
 Due to this we can convert
our PC or mobile into
HART communication.

8. THE BENEFITS OF HART PROTOCOL COMMUNICATION IN
SMART INSTRUMENTATION SYSTEMS
• Access to all instrument parameters & diagnostics.
• Supports multivariable instruments.
• On-line device status.
Digital
Capability
• Simultaneous analog & digital communication.
• Compatible with existing 4-20 mA equipment & wiring
Interoperability.
• Fully open de facto standard.
• Enhanced by Device Description Language.
Analog
Compatibility
• Field proven technology with more than 1,400,000
installations
• Large and growing selection of products
• Used by more smart instruments than any other in the
industry
Availability

9. Leverage the capabilities of a full set of
intelligent device data for operational
improvements.
Gain early warnings to variances in device,
product or process performance.
Speed the troubleshooting time between the
identification and resolution of problems.
Continuously validate the integrity of loops
and control/automation system strategies.
Increase asset productivity and system
availability.

11. • Detect device and/or process connection problems real time.
• Minimize the impact of deviations by gaining new, early warnings.
• Avoid the high cost of unscheduled shutdowns or process disruptions
Increase Plant Availability
• Quickly verify and validate control loop and device configuration.
• Use remote diagnostics to reduce unnecessary field checks.
• Capture performance trend data for predictive maintenance
diagnostics.
• Reduce spares inventory and device management costs.
Reduce Maintenance Costs
• Enable automated record keeping of compliance data.
• Facilitates automated safety shutdown testing.
• Raise SIL/safety integrity level with advanced diagnostics.
• Take advantage of intelligent multivariable devices for more thorough,
accurate reporting.
Improve regulatory compliance

12. Cost-Saving Applications.
Inventory Management Applications.
Open Architecture Applications.
Safety integrity.

14. • It is based on the Bell 202 standard, using frequency shift keying (FSK) to
communicate at 1200 bps
HART Physical Layer
• It defines a master-slave protocol - in normal use, a field device only replies
when it is spoken to.
HART Data Link Layer
• It provides routing, end-to-end security, and transport services.
Network Layer
• The Data-Link Layer ensures communications are successfully propagated
from one device to another.
Transport Layer
• It defines the commands, responses, data types and status reporting supported
by the Protocol.
Application Layer

15. • provide functions which must be implemented in all field
devices
Universal Commands
• - provide functions common to many, but not all field devices
Common Practice Commands
• - provide functions that are unique to a particular field device
and are specified by the device manufacturer
Device Specific Commands
• provide a set of standardized functions for instruments with
particular measurement types, allowing full generic access
without using device-specific commands.
Device Family Commands

16. • Read manufacturer and device type.
• Read or write 32-character message.
• Read primary variable (PV) and units.
• Read or write final assembly number .
Universal
Commands
• Read selection of up to four dynamic variables.
• Write damping time constant.
• Write device range values
• Write transfer function (square root/linear).
• Read or write dynamic variable assignments
Common
Practice
Commands
• Read or write low-flow cut-off.
• Read or write density calibration factor.
• Read or write materials or construction information.
• Trim sensor calibration.
• Local display information.
Device
Specific
Commands

18.  www.google.com
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 http://wiki.answers.com
 http://www.ehow.com
 https://www.google.co.in/search
 www.wikipedia.in

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