F; Profile structure HART
Appendix F: HART Information Structure
SITRANS LR 460 detects a material level via the sensor, and then processes that information to provide a measured value. The measured value is conveyed as a digital signal.
The LR 460 device design enables it to provide outputs to two different channels:
•a
•a digital channel
Block Model for recording and processing measured values
The LR 460 follows a profile block model similar to a PROFIBUS Profile 3.01, Class B, PA device. The functions of the device are divided into blocks.
Information is recorded by the sensor, then passed through the Level Transducer Block to two independent Analog Input Function Blocks (AIFB1 and AIFB2).
The parameters used to configure the Function Blocks are standard profile parameters, following a convention similar to that used in the PROFIBUS Profile Structure. They can be modified by HART communications via PDM.
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| Analog |
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| electronics |
| Input |
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| temperature |
| Function |
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| PV | Block 1 | HART | |
| Level |
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| SV1 |
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sensor |
| PV | |||
Transducer | Analog | ||||
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| Block | SV2 | Input |
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| Function |
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| Block 2 | HART | |
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| SV | |
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| HART | |
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| Digital | |
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| Channel |
mA Output Block
Level Transducer Block (LTB)
The Level Transducer Block carries out adjustments to the sensor, such as level calibration. It supplies the output (Primary Value/PV, or Secondary Value 1/SV!, or Secondary Value 2/SV2) which is utilized by either or both of the AIFBs.
Page | SITRANS LR 460 (HART) – INSTRUCTION MANUAL | 7ML19985JM01 |
