Emerson 3051S Dokumentacja Pobierz pdf (Strona 12)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

1-4

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.

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.

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.

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.

Integrator Block

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.

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.

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