Emerson 3051S Dokumentacja Pobierz pdf (Strona 231)

Reference Manual

00809-0200-4801, Rev CA

July 2010

D-1

Rosemount 3051S

Appendix D 3051S FOUNDATION fieldbus

Revision 23 Release

New Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-1

New Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-2

NEW FUNCTION

BLOCKS

Compensated Mass Flow Transducer Block

This block has all the functionality of the 3095 MultiVariable Mass Flow

transmitter with its fully compensated real-time mass flow calculation. It uses

the 3095 Engineering Assistant configuration package that contains a built in

property data base with 110 fluids/gases and over 25 different primary

elements to configure the flow calculation. The block can receives Line

Pressure and Temperature measurements from separate Pressure and

Temperature transmitters on the segment.

It also supports fixed static pressure and/or process temp values, entered by

the operator.

The Mass flow value can be displayed on the LCD and can be totalized in the

Integrator Block.

Analog Output Blocks

Two Analog Output Blocks are used bring in the static pressure and

temperature variables needed to calculate mass flow.

Control Selector

The Control Selector is designed to select one of two or three inputs for

control. The selection can be the highest, middle, or lowest. The inputs are

normally connected to the outputs of PID or other function blocks. The block is

configured to use one of the inputs to control its output. The other two inputs

can be configured to override the selected input if the process conditions so

require.

Output Splitter

The output splitter is designed to split the output of one PID or other control

blocks so it can control two valves or actuators. Although there are many uses

for the block, the example below is controlling the temperature inside a

reactor with exothermic reaction. In order to start the reaction, the reactants

have to be heated. The controller signal is split in a way to have the heating

fluid valve controlling the temperature while the cooling valve remains closed.

When the reaction starts, heat is liberated and the heating valve is closed.

The coolant valve takes over. The block allows different combinations of

actions.

Multiple Analog Input

A MAI block was added to publish statistical data from the Advanced

Diagnostic Block.

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