DIGITAL TRANSDUCER
Configuration and Modbus Interface
PRELIMINARY
PCS III Technical Description CANopen 1r1 UK 310715.docx
09/02/2021
S2Tech srl
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9.
LIN module setting
PCS III transducer, has the possibility to apply - on the displacement measurements - a conversion into an
Engineering unit (
Dependent
Measurement ) that is different from the one used when the transducer has
been Factory calibrated (
Independent
Measurement).
This is obtained using an integrated Linearization module that performs the conversion task using
up to
32/64 characterization points
, that must be entered by the User to describe the relationship between the
original measurement (
independent
variable, X) and the derived data that results from the computation
(
dependent
variable, Y).
To modify the corresponding parameters, the CANopen connection is used.
The characterization points may describe a linear relationship between the X and Y variables or may
describe a non-linear relationship, like when on a level measurement there is the need to convert a linear
displacement measurement (vertically installed transducer) into a volume measurement, considering a
circular shape of a tank (or a tank with a non-regular shape).
The linearization module, in this latter case will consider the circular shape as a sequence of straight lines
that will represent the internal profile of the tank, with an approximation.
The use of a high number of points to characterize the shape will reduce the over mentioned
approximation.
It is also possible to use this module to define a proportional or inverse relationship between the
Independent measurements (X) and the dependent ones (Y), or to shift the measurements, just by defining
a relationship on the endpoints.
