Comunicacion Hart
Páginas: 29 (7088 palabras)
Publicado: 10 de abril de 2012
Technical Information
HART Communications
4
Part 4 Communications
Technical Information
Part 1: Part 2: Part 3: Part 4: Part 5: Part 6: Fundamentals Self-operated Regulators Control Valves Communication Building Automation Process Automation
Should you have any further questions or suggestions, please do not hesitate to contact us: SAMSON AG V74 / Schulung Weismüllerstraße 3 D-60314Frankfurt Phone (+49 69) 4 00 94 67 Telefax (+49 69) 4 00 97 16 E-Mail: schulung@samson.de Internet: http://www.samson.de
Part 4 ⋅ L452 EN
HART Communications
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 HCF user organization . . . . . . . . . . . . . . . . . . . . . . . . 6 Connecting HART devices . . . . . . . . . . . . . . . . . . . . . . . 7 Number of participants andaddressing . . . . . . . . . . . . . . . . . . . . . . 8
4Point-to-point connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4Multidrop mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4Bus for split-range operation . . . . . . . . . . . . . . . . . . .. . . . . . . . 10 4FSK bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Two-wire technique and load impedance. . . . . . . . . . . . . . . . . . . . 13 Application in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Field device interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 HART communication layers. . . . . . . . . . . . . . . . . . . . . 16 Physical layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4Coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4Plug connectors . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 18 4HART-compatible features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Services of layer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SAMSON AG ⋅ 99/12
4Access control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4Communication services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
CONTENTS
3
4Higher-level communication systems . . . . . . . . . . . . . . . . . . . . . 12
Communications ⋅ HART Communications
4Telegram structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4Noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4Transmission time and user data rate . . . . . . . . . . . . . . . . . . . . . 25Application layer: HART commands . . . . . . . . . . . . . . . . . . . . . . . 26 DDL device description . . . . . . . . . . . . . . . . . . . . . . . . 29 Requirements to be met by the configuration devices . . . . . . . . . . 32 Example: IBIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 HART handheld master device . . . . . . . . . . . . . . . . . . . . . . .. . . . 33 Appendix A1: Troubleshooting . . . . . . . . . . . . . . . . . . . . 35 Appendix A2: Additional literature . . . . . . . . . . . . . . . . . . 36
CONTENTS
4
SAMSON AG ⋅ V74/ DKE
Part 4 ⋅ L452 EN
Introduction
conventional 4 to 20 mA technique. HART devices communicate their data over the transmission lines of the 4 to 20 mA system. This enables the field devices to beparameterized and started up in a flexible manner or to read measured and stored data (records). All these tasks require field devices based on microprocessor technology. These devices are frequently called smart devices. Introduced in 1989, this protocol has proven successful in many industrial applications and enables bidirectional communication even in hazardous environments. HART allows the use of up to...
HART Communications
4
Part 4 Communications
Technical Information
Part 1: Part 2: Part 3: Part 4: Part 5: Part 6: Fundamentals Self-operated Regulators Control Valves Communication Building Automation Process Automation
Should you have any further questions or suggestions, please do not hesitate to contact us: SAMSON AG V74 / Schulung Weismüllerstraße 3 D-60314Frankfurt Phone (+49 69) 4 00 94 67 Telefax (+49 69) 4 00 97 16 E-Mail: schulung@samson.de Internet: http://www.samson.de
Part 4 ⋅ L452 EN
HART Communications
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 HCF user organization . . . . . . . . . . . . . . . . . . . . . . . . 6 Connecting HART devices . . . . . . . . . . . . . . . . . . . . . . . 7 Number of participants andaddressing . . . . . . . . . . . . . . . . . . . . . . 8
4Point-to-point connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4Multidrop mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4Bus for split-range operation . . . . . . . . . . . . . . . . . . .. . . . . . . . 10 4FSK bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Two-wire technique and load impedance. . . . . . . . . . . . . . . . . . . . 13 Application in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Field device interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 HART communication layers. . . . . . . . . . . . . . . . . . . . . 16 Physical layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4Coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4Plug connectors . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 18 4HART-compatible features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Services of layer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SAMSON AG ⋅ 99/12
4Access control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4Communication services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
CONTENTS
3
4Higher-level communication systems . . . . . . . . . . . . . . . . . . . . . 12
Communications ⋅ HART Communications
4Telegram structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4Noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4Transmission time and user data rate . . . . . . . . . . . . . . . . . . . . . 25Application layer: HART commands . . . . . . . . . . . . . . . . . . . . . . . 26 DDL device description . . . . . . . . . . . . . . . . . . . . . . . . 29 Requirements to be met by the configuration devices . . . . . . . . . . 32 Example: IBIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 HART handheld master device . . . . . . . . . . . . . . . . . . . . . . .. . . . 33 Appendix A1: Troubleshooting . . . . . . . . . . . . . . . . . . . . 35 Appendix A2: Additional literature . . . . . . . . . . . . . . . . . . 36
CONTENTS
4
SAMSON AG ⋅ V74/ DKE
Part 4 ⋅ L452 EN
Introduction
conventional 4 to 20 mA technique. HART devices communicate their data over the transmission lines of the 4 to 20 mA system. This enables the field devices to beparameterized and started up in a flexible manner or to read measured and stored data (records). All these tasks require field devices based on microprocessor technology. These devices are frequently called smart devices. Introduced in 1989, this protocol has proven successful in many industrial applications and enables bidirectional communication even in hazardous environments. HART allows the use of up to...
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