Campbell CR5000 Especificações descarregar pdf (Página 211)

Section 9. Program Control Instructions

9-5

Repeats a block of statements while a condition is true or until a condition

becomes true.

Syntax 1

Do [{While | Until} condition]

[statementblock]

[Exit Do]

[statementblock]

Loop

Syntax 2

[statementblock]

[Exit Do]

[statementblock]

Loop [{While | Until} condition]

The Do...Loop statement has these parts:

Part Description

Do Must be the first statement in a Do...Loop control structure.

While Indicates that the loop is executed while condition is true.

Until Indicates that the loop is executed until condition is true.

condition Numeric expression that evaluates true (nonzero) or false (0

or Null).

statementblock Program lines between the Do and Loop statements that are

repeated while or until condition is true.

Exit Do Only used within a Do...Loop control structure to provide an

alternate way to exit a Do...Loop. Any number of Exit Do

statements may be placed anywhere in the Do...Loop. Often

used with the evaluation of some condition (for example,

If...Then), Exit Do transfers control to the statement

immediately following the Loop. When Do...Loop

statements are nested, control is transferred to the Do...Loop

that is one nested level above the loop in which the Exit Do

occurs.

Loop Ends a Do...Loop.

Do...Loop Statement Example

The example creates an infinite Do...Loop that can be exited only if Volt(1) is

within a range.

Dim Reply 'Declare variable.

Reply = Volt(1)

If Reply > 1 And Reply < 9 Then 'Check range.

Exit Do 'Exit Do Loop.

End If

Loop

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