Of Operation 2

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APPLICATION GUIDE
HCF LIT 34

Preface 1
Theory of Operation 2
Communication Modes 3
Master-Slave Mode 3
Burst Mode 3
Frequency Shift Keying 4
HART Networks 5
Point-to-Point 5
Multidrop 6
HART Commands 7
Universal 7
Common Practice 7
Device Specific 7
Summary Table 7
Establishing Communication with a HART Device 8
Device Description 8
Benefits of HART Communication 9
Improved Plant Operations 10
Cost Savings in Commissioning 10
Cost Savings in Installation 10
Improved Measurement Quality 11
Cost Savings in Maintenance 12
Operational Flexibility 13
Instrumentation Investment Protection 14
Compatibility of HART Revisions 14
Digital Communication 15
Getting the Most out of HART Systems 16
Wiring and Installation 17
Cable Length 17
Intrinsic Safety 18
Intrinsic Safety Devices 18
Designing an IS System Using Shunt-Diode Barriers 19
Designing an IS System Using Isolators 20
Multidrop IS Networks 21
IS Output Loops 21
IS Certification Considerations 21
IS Network Cable Length Calculations 21
HART Multidrop Networks 22
Multidrop with HART Field Controllers 23
Application Considerations 23
Configuring Devices for Multidrop Operation 23