ACR Electronics FPR-10 PROGRAMMER Manuel télécharger pdf (Page 55)

Parker Hannifin

Programming Basics 55

WHILE/WEND

The WHILE/WEND loop executes as long as its condition remains true.

You can use the WHLE/WEND anywhere in a program.

The WHILE sets the condition, and is followed by statements you

want executed when the condition is true. When the condition is

false, the statement immediately following WEND executes. The

condition is evaluated only at the beginning of the loop.

When using a WHILE/WEND statement, observe the following:

• Do not nest GOTO statements in an WHILE/WEND statement.

• At the start of each loop through the WHILE condition, the

validity of the condition is tested.

Example

The following demonstrates a WHILE/WEND loop. While the encoder

position for axis 2 is less than 1500 units, the WHILE statement

evaluates as true. As the loop runs, the array acts as a counter,

incrementing with each loop; axis X move an incremental 25 units;

the program pauses for 1.5 seconds, then prints the current value of

the array; and if the input (bit 24) is set the loop breaks. When the

encoder count exceeds 1500, the condition is false and execution

moves past the WEND statement.

WHILE (P6176 < 1500)

LA0(1) = LA0(1) + 1

X/25

DWL 1.5

PRINT LA0(1)

IF (BIT 24)

BREAK

ENDIF

WEND

Other Conditional Statements

There are two additional program flow control commands: INH and

IHPOS. The INH command lets you inhibit (pause) program execution

until the state of a selected bit (set or clear) occurs. Similarly, the

IHPOS command lets you inhibit program execution until a specific

axis position is occurs.

INH

The INH command lets you inhibit program execution based on the

set or clear state of a specified bit.

NOTE: Do not use INH in non-motion programs. If you have multiple

non-motion programs, an inhibit in one non-motion program

affects all non-motion programs.

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ACR Electronics FPR-10 PROGRAMMER Manuel Page 55

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