Rosemount 3051SFC_A User Manual

Reference Manual
00809-0100-4809, Rev DA
Appendix A: Specifications and Reference Data
September 2015
150
Specifications and Reference Data
FOUNDATION Fieldbus function block execution times
F
OUNDATION Fieldbus parameters
Standard function blocks
Resource block
 The resource block contains diagnostic, hardware and
electronics information. There are no linkable inputs
or outputs to the Resource Block.
Transducer block
 The sensor transducer block contains sensor
information including the sensor diagnostics and the
ability to trim the pressure sensor or recall factory
calibration.
LCD display transducer block
 The LCD display transducer block is used to configure
the LCD display meter.
Analog input (AI) block
 The AI block 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.
Note
The channel, Set XD_Scale, Set L_Type, and sometimes
Set Out_Scale are typically configured by instrument
personnel. Other AI block parameters, block links, and
schedule are typically configured by the control
systems configuration engineer.
Input selector (ISEL) block
 The ISEL block can be used to select the first good, Hot
Backup
™
, maximum, minimum, or average of as many
as eight input values and place it at the output. The
block supports signal status propagation.
Integrator (INT) block
 The INT block integrates one or two variables over
time. The block compares the integrated or
accumulated value to pre-trip and trip limits and
generates discrete output signals when the limits are
reached. The INT block is used as a totalizer. This block
will accept up to two inputs, has six options how to
totalize the inputs, and two trip outputs.
Arithmetic (ARTH) block
 The ARTH block provides the ability to configure a
range extension function for a primary input. It can
also be used to compute nine different arithmetic
functions including flow with partial density
compensation, electronic remote seals, hydrostatic
tank gauging, ratio control and others.
Signal characterizer (SGCR) block
 The SGCR block characterizes or approximates any
function that defines an input/output relationship.
The function is defined by configuring as many as
twenty X,Y coordinates. The block interpolates an
output value for a given input value using the curve
defined by the configured coordinates. Two separate
analog input signals can be processed simultaneously
to give two corresponding separate output values
using the same defined curve.
PID block
 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.
Block Execution time
Resource N/A
Trans ducer N/A
LCD display Block N/A
Analog Input 1, 2 20 milliseconds
PID 25 milliseconds
Arithmetic 20 milliseconds
Input Selection 20 milliseconds
Signal Characterizer 20 milliseconds
Integrator 20 milliseconds
Output Splitter 20 milliseconds
Control Selector 20 milliseconds
Schedule Entries 7 (max.)
Links 20 (max.)
Virtual Communications Relationships
(VCR)
12 (max.)

Rosemount 3051SFC_A Specifications

General

Brand	Rosemount
Model	3051SFC_A
Category	Measuring Instruments
Language	English