Siemens LR 460 User Manual
Page F-90
SITRANS LR 460 (HART) – INSTRUCTION MANUAL
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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.
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 4-20 mA channel
• a digital channel
• 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.
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).
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.
following a convention similar to that used in the PROFIBUS Profile Structure. They can
be modified by HART communications via PDM.
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.
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.
sensor
sensor
Level
Transducer
Block
electronics
temperature
Analog
Input
Function
Block 2
Analog
Input
Function
Block 1
mA
Output
Block
HART
SV
HART
PV
HART
Digital
Channel
4-20 mA
Channel
SV1
SV2
SV2
PV