HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 322)

322
4.35 Conditional Bloc
k Run
4.35 Conditional Block Run
Program branching IF..THEN..ELSE..ENDIF
A conditional branch consists of the elements:
„ IF, followed by a condition. The condition includes a variable or
mathematical expression on either side of the relational operator.
„ THEN. If the condition is fulfilled, the THEN branch is executed
„ ELSE. If the condition is not fulfilled, the ELSE branch is executed
„ ENDIF concludes the conditional program branch.
Programming:
U Select “Instr. > DIN PLUS words” in the machining menu. The CNC
PILOT opens the “DIN PLUS words” selection list.
U Select IF
U Enter the condition
U Insert NC blocks of the THEN branch.
U If required: Insert NC blocks of the ELSE branch.
V variables are included during simulation. The V variables can be
assigned values. Thus all branches of your NC program can be tested.
Relational operators for
< Less than
<= Less or equal
<> Not equal
> Greater than
>= Greater than or equal
== Equal
Combining conditions:
AND Logical AND operation
OR Logical OR operation
Example: IF..THEN..ELSE..ENDIF
. . .
N.. IF{E1[16]==1}
N.. THEN
N.. G0 X100 Z100
N.. ELSE
N.. G0 X0 Z0
N.. ENDIF
. . .
„ NC blocks with IF, THEN, ELSE, ENDIF can have no
further commands.
„ You can combine up to two conditions.
„ For branches due to V variables or events, the contour
follow-up is switched off with the IF statement and back
on with the ENDIF statement. With G702, G703 or G706
you control the contour follow-up.