Description Of The Blocks; Transducer Block Function Groups - Siemens Sitrans LR 460 Instruction Manual

Description of the blocks

Transducer block function groups

The figure below shows the signal flow of measured values from the sensor through the
Transducer block into the output value (Primary Value/ Level or Volume; Secondary Value
1 / Level; Secondary Value 2 /Distance 1; or Secondary Value 3 / Distance 2). The Level TB
implements all of the basic parameters (see parameter diagram on page 54), including
level to volume calculation, if that option has been selected.
Level Transducer Block
Sensor Value
Sensor
Sensor
technology
Sensor
Offset
How the LTB works:
1. The sensor technology block selects the proper echo. For an explanation of sensor
technology, please refer to
The sensor value (in sensor units) is checked to see if it is within its measuring limits.
If the limit is exceeded, this results in a Bad status and the error message Failure in
measurement. The sensor value is stored in Sensor Value.
The analog signal from the sensor is transformed into a digital signal.
A Sensor Offset (default 0) provides compensation if necessary for changes in the
sensor.
7ML19985JM01
Level
Level
calibration
Level
Offset
Low
High
Calibration
Calibration
Point
Point
Low Level
High Level
Point
Point
Calibration
Type
Sensor
Level unit
conversion
Appendix B: Technical Reference
SITRANS LR 460 – INSTRUCTION MANUAL
Primary Value
[Level/Volume]
(level/volume units)
PV
Linearization
Linearization
Type
SV1
Secondary Value 1
[Level]
(Level Units)
SV2
Secondary Value 2
[Distance 1]
(Sensor Units)
SV3
Secondary Value 2
[Distance 2]
(Level Units)
, page 82 onwards.
AIFB1
(Analog
Input)
AIFB2
(Analog
Input)
Page 53