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four variables, all other device variables are marked as inactive and have the CONSTANT
status.
These four variables are mapped with dynamic variables PV, SV, TV and QV by default.
Switching an inactive device variable to the primary variable (PV) generates an error message
since the variable currently does not have a valid measured value. This message is displayed
in SIMATIC PDM or the HART communicator.
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DV Device variable
MA Start of scale value
ME Full scale value
PV Primary variable
QV Quarternary variable
SV Secondary variable
TV Tertiary variable
Figure 7-1 Measuring mode "Pressure"
7.3.5
Customized characteristic curve
Introduction
The customized "characteristic curve" is continuously active as an identical function in the
three following measuring modes "Level", "Flow rate" and "User". This means that the
customized "characteristic curve" always provides a result for the following function, thus also
influencing the measured value status of the affected device variables.
Operating functions through HART
7.3 Selecting the measuring modes
SITRANS P, DS III series with HART
102 Operating Instructions, 09/2012, A5E00047092-08
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