HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 324)

324
4.35 Conditional Bloc
k Run
SWITCH..CASE—program branching
The switch statement consists of the elements:
„ SWITCH, followed by a variable. The content of the variables is
interrogated in the following CASE instruction.
„ CASE x: The CASE branch is run with the variable value x. CASE can
be programmed repeated times.
„ DEFAULT: This branch is executed if no CASE instruction matched
the variable value. DEFAULT can be omitted.
„ BREAK: Concludes the CASE branch or DEFAULT branch
Programming:
U Select “Instr. > DIN PLUS words” in the machining menu. The CNC
PILOT opens the “DIN PLUS words” selection list.
U Select SWITCH
U Enter the switch variable
U For each CASE branch:
„ Select CASE (from the DIN PLUS words selection list)
„ Enter the SWITCH condition (value of the variable) and
insert the NC blocks to be executed.
U For the DEFAULT branch: Insert the NC blocks to be executed.
V variables are included during simulation. The V variables can be
assigned values. Thus all branches of your NC program can be tested.
Example for V variables
Relational operators
< Less than
<= Less or equal
<> Not equal to
> Greater than
>= Greater than or equal
== Equal
Combining conditions:
AND Logical AND operation
OR Logical OR operation
„ You can combine up to two conditions.
„ If the branch is triggered by V variables or events, the
contour follow-up is switched off with the SWITCH
statement and back on with the ENDSWITCH
statement. With G702, G703 or G706 you control the
contour follow-up.
. . .
N.. SWITCH{V1}
N.. CASE 1 [EXECUTED IF V1=1] Executed if V1=1
N.. G0 XI10
. . .
N.. BREAK
N.. CASE 2 [EXECUTED IF V1=2] Executed if V1=2
N.. G0 XI20
. . .
N.. BREAK
N.. DEFAULT No CASE instruction matched the variable value
N.. G0 XI30
. . .