Transducer Block Function Groups; How The Transducer Block Works - Siemens SITRANS LR560 Operating Instructions Manual

PROFIBUS PA profile structure
B.3 Transducer Block function groups
B.3

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 (PV)
● Secondary Value 1 (SV1): Level
● Secondary Value 2 (SV2): Distance
The Transducer Block implements all of the basic parameters of the PROFIBUS profile
standard (illustrated in step 2 below).
Transducer Block
PV output is provided for PROFIBUS Profile for Process Devices 3.01 compatibility.
1)
B.4

How the transducer block works:

The sensor technology sub-block selects the proper echo. For an explanation of sensor
technology, see Technical reference (Page 165).
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.
178
: Level or Volume
1)
LR560 (PROFIBUS PA)
Operating Instructions, 06/2018, A5E34648471-AE