Conditional if-goto – Rockwell Automation 8520 9/Series CNC Lathe User Manual

Page 683

Paramacros

Chapter 28

28-9

Example 28.7

Unconditional GOTO

N1...;

N2...;

N3GOTO5;

N4...;

N5...;

N6...;

/N7GOTO1;

In Example 28.7, execution continues sequentially until block N3 is read;

then execution transfers to block N5 and again resumes sequential

execution to block N6. If optional block skip 1 is off, block N7 will

transfer execution back to block N1.

Conditional IF-GOTO

The conditional IF-GOTO command is dependent on whether a

mathematical condition is true. If this condition is true, execution will

transfer to the block specified.

Use this format for the IF-GOTO command:

IF [(condition)] GOTO n;

Where :

Is :

(condition)

some mathematical condition. This condition is tested by the control to determine if

it is true or false.

if the condition is tested as true, execution is transferred to the block specified as n

If the condition is tested as false, execution falls through the block and the

GOTO is not executed. Program execution continues in a normal fashion.

Example 28.8

Conditional IF

N1...;

N2IF[#3EQ-1.5]GOTO5;

N3...;

N4...;

N5...;

N6IF[#4LT3]GOTO1;

N7...;