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Reference Manual
00809-0100-4021, Rev DA
November 2004
4-5
Rosemount 3144P
FOUNDATION Fieldbus
Analog Input Block (index number 1400, 1500, and 1600)
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 widely used for scaling
functionality.
PID Block (index number 1700 and 1800)
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. You
can choose the appropriate equation using the MATHFORM parameter. The
Standard ISA PID equation is the default selection and Autotune.
Input Selector (index number 1900)
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.
Output Splitter (index number OSPL 2200)
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.
Arithmetic (index number 2100)
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.
Signal Characterizer (index number 2000)
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.
RESOURCE BLOCK
FEATURES and
FEATURES_SEL
The parameters FEATURES and FEATURE_SEL determine optional
behavior of the 3144P.
FEATURES
The FEATURES parameter is read only and defines which features are
supported by the 3144P. Below is a list of the FEATURES the 3144P
supports.
UNICODE
All configurable string variables in the 3144P, except tag names, are octet
strings. Either ASCII or Unicode may be used. If the configuration device is
generating Unicode octet strings, you must set the Unicode option bit.