Sensor Transducer Block (Index Number 1100) - Emerson Rosemount 3144P Reference Manual

Reference Manual
00809-0100-4021, Rev JA
4.4.2

Sensor transducer block (index number 1100)

The Sensor Transducer Function Block (STB) temperature measurement data, includes sensor and
terminal (body) temperature. The STB also includes information about sensor type, engineering units,
linearization, reranging, damping, temperature compensation, and diagnostics. Transmitter Revision 3
and above also contain Hot Backup
4.4.3 LCD display transducer block (index number 1200)
The LCD display transducer block is used to configure the LCD display.
4.4.4 Analog input block (index number 1400, 1500, 1600, and 1700)
The Analog Input Function Block (AI) processes the measurements from the sensor and makes them
available to other function blocks. The output value from the AI block is in engineering units and
contains a status indicating the quality of the measurement. The AI block is used for scaling functionality.
4.4.5 PID block (index number 1800 and 1900)
The PID function block combines all of the necessary logic to perform proportional/integral/derivative
(PID) control. The block supports mode control, signal scaling and limiting, feed forward control,
override tracking, alarm limit detection, and signal status propagation.
The block supports two forms of the PID equation: Standard and Series. Choose the appropriate
equation using the MATHFORM parameter. The Standard ISA PID equation is the default selection and
autotune.
4.4.6 Input selector (index number 2000)
The signal selector block provides selection of up to four inputs and generates an output based on the
configured action. This block normally receives its inputs from AI blocks. The block performs maximum,
minimum, middle, average, and 'first good' signal selection.
4.4.7 Output splitter (index number OSPL 2300)
The output splitter block provides the capability to drive two control outputs from a single input. Each
output is a linear function of some portion of the input.
4.4.8 Arithmetic (index number 2200)
This block is designed to permit simple use of popular measurement math functions. The user does not
have to know how to write equations. The math algorithm is selected by name, chosen by the user for
the function to be done.
4.4.9 Signal characterizer (index number 2100)
The signal characterizer block has two sections, each with an output that is a non-linear function of the
respective input. The non-linear function is determined by a single look-up table with 21 arbitrary x-y
pairs. The status of an input is copied to the corresponding output, so the block may be used in the
control or process signal path.
Configuration
™
functionality in the STB.
Configuration
April 2017
137