Operator control functions via PROFIBUS
7.4 Settings
SITRANS P DS III with PROFIBUS PA
114 Operating Instructions, 06/2013, A5E00053276-07
Figure 7-7 Application point of the root function and creep quantity suppression
Flow measurement correction
If you want to carry out a correction in your application (for example to take account of the
flow coefficient α and the expansion coefficient ε), select:
● Characteristic curve type: Root extracted and characteristic curve
● Nodes: For a maximum of 31 nodes, enter an input value (measured volume flow) and an
output value (corrected volume flow).
Configuration of user data (Page 159)
Adjusting to a desired process value
The analog input function block has the purpose of mapping the measured value to the
process value. In general, you want to direct the measured value straight to the bus: Then
the input and output range is taken from the working range.
If the measured pressure or the fill level has an indirect but linear relation to the process
value, however, assign the start and final values of the input range to start and final values
for the output range. The following examples illustrate this:
The
is shown by means of two concrete application examples.
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