Of Operation 2

Digital Communication

A digital instrument that uses a microprocessor provides many benefits. These benefits are found in all smart devices regardless of the type of communication used. A digital device provides advantages such as improved accuracy and stability. The HART protocol enhances the capabilities of digital instruments by providing communication access and networking (Table 2).

Benefits	HART Instruments	Digital Instruments
Accuracy and stability Reliability Multivariable Computations Diagnostics Multiple sensor inputs Ease of commissioning Tag ID Remote configuration Loop checks Adjustable operational parameters Access to historical data Multidrop networking Access by multiple host devices Extended communication distances Field-based control Interoperability	✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓	✓ ✓ ✓ ✓ ✓ ✓

Table 2: Digital Instruments Versus HART Instruments

Getting the Most out of HART Systems

To take full advantage of the benefits offered by the HART communication protocol, it is important that you install and implement the system correctly. The following sections contain information that can help you to get the most from your HART system:

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  Wiring and Installation
  
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  Intrinsic safety
  
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  HART multidrop networks
  
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  Control system interfaces
  
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  Multiplexers
  
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  Reading HART data into nonHART systems
  
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  Universal handheld communicator
  
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  PC configuration software
  
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  Commissioning HART networks
  
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  Device status and diagnostics
  
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  Connecting a PC to a HART device or network
  
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  PC application development tools
  
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  Control in field devices
  

GETTING THE MOST From HART SYSTEMS