How The Transducer Block Works - Siemens SITRANS L Operating Instructions Manual

PROFIBUS PA profile structure
D.4 How the transducer block works
D.4

How the transducer block works

1. The sensor technology sub-block selects the proper echo. For an explanation of sensor
technology, see Technical reference (Page 176).
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 representation.
A Sensor Offset (default 0) compensates for changes to the sensor reference point, if
necessary.
2. Level Calibration is a linear transfer function that converts a sensor value to a level value.
①
②
③
④
⑤
196
Low level point (default 0%)
Level
Sensor value
1)
High level point (default 100%)
Distance/SV2
⑥ High calibration point
⑦ Sensor reference point
⑧ Low calibration point
⑨ Secondary value 1
⑩ Level offset
3)
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
2)