Measured Value Status - Siemens SITRANS P DS III Operating Instructions Manual

Operating functions through HART
7.3 Selecting the measuring modes
In the calculation example, the two pairs of values 0%;0% and 100%;100% are configured
for the customized "characteristic curve". Any curve shapes can be calculated with the help
of 30 characteristic curve vertices. These curve shapes can be stored in the device using
SIMATIC PDM or the HART communicator.
In the calculation example, the value at the input of the characteristic curve is transferred 1:1
to the output.
In the calculation example, a number of filled cans is set for the output scaling. You can
enter up to five characters for any given unit. Do not confuse this with the user-
programmable display unit of the "Analog output" block.
In the calculation example, you have a start of scale value of 0 cans and a full scale value of
1000 cans. At a process pressure of 0.5 bar, you get a value of 250 cans for the "User"
device variable.
See also
Analog output (Page 120)
Measured value status (Page 116)
7.3.9

Measured value status

Introduction
Every device variable is assigned a status byte to indicate the quality of the measured
values. This status byte can have the following values:
● BAD
● GOOD
● MANUAL
● UNCERTAIN
The following values are also possible:
● CONSTANT
● HIGH LIMIT
● LOW LIMIT
A higher-level diagnosis program can display and analyze these states.
GOOD status
During smooth, uninterrupted operation, the measured value status of all active device
variables is GOOD.
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SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09