Emerson Bristol ControlWave Express Manual de usuario descargar pdf (Pagina 4)

Product Data Document

420DS-3d

July 16, 2007 - Page 4

Bristol

ControlWave

Designer

Remote Automation Solutions

Website: www.EmersonProcess.com/Remote

Ladder Diagram (LD) employs the elements

common to traditional PLCs’ such as normally open

& normally closed contacts and coils. Ladder is typi-

cally used for sequential logic, interlocks and on/off

control applications.

Function Block Diagram (FDB) is a graphi-

cal programming language that resembles the P&I

drawings or circuit diagrams commonly found in pro-

cess control applications. The graphical represen-

tation makes analog control loops visually easy to

understand and auto-documents the control scheme.

Function Block Diagram programs also allow the use

of Ladder Logic in the same program. With De-

signer, you can even have Ladder objects as inputs

to FB and outputs from the FB objects. User De-

ned Function Blocks can be used in Function Block

programs as well.

Structured Text (ST) is a high level text based

language containing all the elements of a modern

programming language. As well as providing a

convenient method of including the library of function

blocks and creating custom function blocks, it allows

IF-THEN-ELSE and other conditional branching

statements.

Sequential Function Chart (SFC) allows se-

quential operations to be programmed in a graphical

manner similar to a ow chart. The steps represent

the actions, which can be performed in sequence or

in parallel, and the transitions represent the condi-

tions that must be completed in order to advance to

the next step.

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Emerson Bristol ControlWave Express Manual de usuario Pagina 4