Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Instrukcja Użytkownika Pobierz pdf (Strona 654)

100

101

Paramacros

Chapter 20

20-10

Example 20.8 illustrates the use of the conditional IF-GOTO command.

Example 20.8

Conditional IF

N1...;

N2IF[#3EQ-1.5]GOTO5;

N3...;

N4...;

N5...;

N6IF[#4LT3]GOTO1;

N7...;

When block N2 is read, parameter #3 is compared to the value -1.5. If the

comparison is true, blocks N3 and N4 are skipped and execution continues

on from block N5. If the comparison is false, execution continues on to

block N3. When block N6 is read, parameter #4 is compared to the value

3. If the comparison is true, execution is transferred to block N1. If false,

execution continues on to block N7.

Use the DO-END and WHILE-DO-END commands to set up complex

looping structures in your part program. The format for these commands is

shown below.

Unconditional DO-END

The unconditional DO-END command is rarely used. The lack of a

condition here causes the control to loop indefinitely, until you press

<CYCLE STOP> or <E-STOP> or until some other transfer of control

command forces execution out of the loop.

The format for the UNCONDITIONAL DO-END command is:

DO m;

END m;

Where: Is :

m an identifierused torelate a DO blockwith an ENDblock. The value of mmust

be thesame forthe DO and the corresponding END. This value canbeeither1,

2,or 3.

20.2.3

DO-END a nd

WHILE -DO-END Commands

1 2 ... 649 650 651 652 653 654 655 656 657 658 659 ... 819 820

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