Emerson 3051S Dokumentacja Pobierz pdf (Strona 144)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

B-14

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.

Software Upgrade in the Field

Software for the 3051S with F

OUNDATION fieldbus is easy to upgrade in the field using the

OUNDATION fieldbus Common Device Software Download procedure.

PlantWeb Alerts

Enable the full power of the PlantWeb digital architecture by diagnosing instrumentation

issues, communicating advisory, maintenance, and failure details, and recommending a

solution.

Advanced Control Function Block Suite

(Option Code A01)

Input Selector Block

• Selects between inputs and generates an output using specific selection strategies such as

minimum, maximum, midpoint, average, or first “good.”

Arithmetic Block

• Provides pre-defined application-based equations including flow with partial density

compensation, electronic remote seals, hydrostatic tank gauging, ratio control and others.

Signal Characterizer Block

• Characterizes or approximates any function that defines an input/output relationship by

configuring up to twenty X, Y coordinates. The block interpolates an output value for a

given input value using the curve defined by the configured coordinates.

Integrator Bock

• Compares the integrated or accumulated value from one or two variables to pre-trip and

trip limits and generates discrete output signals when the limits are reached. This block is

useful for calculating total flow, total mass, or volume over time.

Output Splitter Block

• Splits the output of one PID or other control block so that the PID will control two valves or

other actuators.

Control Selector Block

• Selects one of up to three inputs (highest, middle, or lowest) that are normally connected to

the outputs of PID or other control function blocks.

Fully Compensated Mass Flow Block (Option Code H01)

Calculates fully compensated mass flow based on differential pressure with external process

pressure and temperature measurements over the fieldbus segment. Configuration for the

mass flow calculation is easily accomplished using the Rosemount Engineering Assistant.

Block Execution Time

Resource -

Transducer -

LCD Block -

Analog Input 1, 2 20 milliseconds

PID with Auto-tune 35 milliseconds

Input Selector 20 milliseconds

Arithmetic 20 milliseconds

Signal Characterizer 20 milliseconds

Integrator 20 milliseconds

Output Splitter 20 milliseconds

Control Selector 20 milliseconds

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 239 240

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