Emerson 3051S Uživatelský manuál stáhnout pdf (Strana 51)

Rosemount 3051

September 2014

www.rosemount.com

LCD transducer block

The LCD transducer block is used to configure the LCD

display meter.

Analog input block

The analog input (AI) function 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.

Input selector block

The input selector (ISEL) function 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 block

The integrator (INT) function 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 Integrator 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 block

The arithmetic (ARTH) function 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

gaging, ratio control, and others.

Signal characterizer block

The signal characterizer (SGCR) function 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.

Control selector block

The control selector function block selects one of two or

three inputs to be the output. The inputs are normally

connected to the outputs of PID or other function blocks.

One of the inputs would be considered normal and the

other two overrides.

Output splitter block

The output splitter function block provides the capability

to drive two control outputs from a single input. It takes

the output of one PID or other control block to control

two valves or other actuators.

Backup Link Active Scheduler (LAS)

The transmitter can function as a Link Active Scheduler if the

current link master device fails or is removed from the

segment.

OUNDATION fieldbus Diagnostics Suite

(option code D01)

The 3051C FOUNDATION fieldbus Diagnostics Suite features

SPM technology to detect changes in the process, process

equipment, or installation conditions (such as plugged

impulse lines) of the transmitter. This is done by modeling the

process noise signature (using the statistical values of mean

and standard deviation) under normal conditions and then

comparing the baseline values to current values over time. If a

significant change in the current values is detected, the

transmitter can generate an alert.

PROFIBUS PA (output code W)

Profile version

3.02

Power supply

External power supply required; transmitters operate on 9.0

to 32.0 V dc transmitter terminal voltage. FISCO transmitters

operate on 9.0 to 17.5 V dc.

Current draw

17.5 mA for all configurations (including LCD display option)

Output update rate

Four times per second

Standard function blocks

Analog input (AI block)

The AI function block processes the measurements and

makes them available to the host device. The output

value from the AI block is in engineering units and

contains a status indicating the quality of the

measurement.

Physical block

The physical block defines the physical resources of the

device including type of memory, hardware, electronics

and diagnostic information.

Transducer block

Contains actual sensor measurement data including the

sensor diagnostics and the ability to trim the pressure

sensor or recall factory defaults.

Indication

Optional 2-line LCD display

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