
Reference Manual
00809-0100-4716, Rev JA
May 2008
Rosemount 3095 MultiVariable
4-20
FIEL
DBUS
Damping
The damping parameter in the Transducer Block may be used to filter
measurement noise. By increasing the damping time, the transmitter will have
a slower response time, but will decrease the amount of process noise that is
translated to the Transducer Block Primary Value. Because both the LCD and
AI Block get input from the Transducer Block, adjusting the damping
parameter will effect the values passed to both blocks.
NOTE
The AI Block has it's own filtering parameter called PV_FTIME. For simplicity,
it is better to do filtering in the Transducer Block as damping will be applied to
primary value on every sensor update. If filtering is done in AI block, damping
will be applied to output every macrocycle. The LCD will display value from
Transducer block.
MASS FLOW
TRANSDUCER BLOCK
The Mass Flow Transducer Block is an optional licensed transducer block.
The Block is configured using the Rosemount Engineering Assistant for
F
OUNDATION
fieldbus software program. The block may be configured to
utilize the process variables measured by the 3095 multivariable transmitter
to include: differential pressure, pressure (gage or absolute) and temperature.
Process variable measurements may also be used from independent
measurement devices on the F
OUNDATION
fieldbus segment. The Mass Flow
Transducer Block can also use a fixed temperature input to calculate mass
flow.
LCD TRANSDUCER
BLOCK
The LCD display connects directly to the Rosemount 3095 electronics
F
OUNDATION
fieldbus output board. The display indicates output and
abbreviated diagnostic messages.
The display features a two-line display and a 0-100% scaled bar graph. The
first line of five characters displays the output description, the second line of
seven digits displays the actual value, the third line of six characters displays
engineering units and the fourth line displays “Error” when the transmitter is in
alarm. The LCD display can also display diagnostic messages.
Each parameter configured for display will appear on the LCD for a brief
period before the next parameter is displayed. If the status of the parameter
goes bad, the LCD will also cycle diagnostics following the displayed variable:
Custom Display
Configuration
Shipped from the factory, Parameter #1 is configured to display the Primary
Variable (pressure) from the LCD Transducer Block. Parameters 2 – 4 are not
configured. To change the configuration of Parameter #1 or to configure
additional parameters 2 – 4, use the configuration parameters below.
The LCD Transducer Block can be configured to sequence four different
process variables as long as the parameters are sourced from a function
block that is scheduled to execute within the 3095 MultiVariable transmitter. If
a function block is scheduled in the 3095 that links a process variable from
another device on the segment, that process variable can be displayed on the
LCD.
DISPLAY_PARAM_SEL
The DISPLAY_PARAM_SEL parameter specifies how many process
variables will be displayed. Select up to four display parameters.
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