Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 651)

100

101

Paramacros

Chapter 20

20-7

Attempting to use any of the above as MDI commands, 9/PC generat es an

“ILLEGAL MACRO CMD VIA MDI” error message.

This section contains the following subsections:

Topic: On page:

ConditionalOperators 20-7

GOTO and IF-GOTOCommands 20-9

DO-ENDandWHILE-DO Commands 20-10

Use transfer of control commands to alter the normal flow of program

execution. Normally the control executes program blocks sequentially.

Using control commands, the programmer can alter this normal flow of

execution and transfer execution to a specific block or begin looping

(executing the same set of blocks repetitively).

Important: Transfer of control commands access a block by its N number.

If more than one N number exists in a block, the control uses only t he

left-most N number in that block. If the same N number is used for more

than one block, the control uses the first block it encounters with the

correct N number. The control searches for an N number starting at its

current position in the program and continuing to the end of the program.

If the N number is not found, the control returns to the top of the program

and continues the search.

Two t ypes of transfer of control commands are available:

Conditional -- The control executes a jump or a loop depending on

whether a mathem atical condition is true

Non-Conditional -- The control executes a jump or loop when the

control executes that block

This subsection covers conditional operators that are available for

paramacro programming. A conditional operator causes a comparison

between two values and yields a result of true or false. The use of

conditional operators in “IF” or “WHILE” commands is covered on pages

20-9 and 20-11.

The true or false condition determines whether the “IF” or “WHILE”

blocks are executed. Table 20.C lists the conditional operators available

for paramacro programming.

20.2

Transfer of Control

Commands

20.2.1

Conditional Operators

1 2 ... 646 647 648 649 650 651 652 653 654 655 656 ... 819 820

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