HEIDENHAIN CNC Pilot 4290 - Manual (Page 191)

HEIDENHAIN CNC PILOT 4290 179
4.15
V
a
riable Pr
ogr
amming
4.15.3 Program Branches, Program Repeats,
Conditional Block Execution
V variables are included during simulation. The V variables can be
assigned values. Thus all branches of your NC program can be
tested.
You can combine up to two conditions.
Logical operators for IF... and WHILE..
< Less than
<= Less than or equal
<> Not equal
> Greater than
>= Greater than or equal
== Equal
Combining conditions:
AND Logical AND operation
OR Logical OR operation
■ The unit counter in V660 is different
from the unit counter in the machine
display.
■ X values are saved as radius values.
■ Note: Functions G901, G902, G903,
G912 and G916 overwrite the variable!
This also applies to variables that have
not yet been evaluated.
Note on interpreter stop (G909)
The CNC PILOT pre-interprets approx. 15 to 20 NC blocks. If
variables are assigned shortly before the evaluation, “old values“
would be processed. An interpreter stop ensures that the
variables contain the new value.
G909 stops the pre-interpretation. The NC blocks are processed up
to G909—after G909 the subsequent NC blocks are processed.
■ Program an interpreter stop if
variables or external events are modified
shortly before the block is run.
■ Each interpreter stop lengthens the run
time of the NC program.
■ Several G functions include the
interpreter stop.
Variable assignment V901 to V920
X Z Y
Slide 1 V901 V902 V903
Slide 2 V904 V905 V906
Slide 3 V907 V908 V909
Slide 4 V910 V911 V912
Slide 5 V913 V914 V915
Slide 6 V916 V917 V918
C axis 1: V919
C axis 2: V920
■ V921: Angular offset of “G906 spindle synchronization“
■ V922/V923: Result of “G905 offset C-angle“
■ V982: Error number of “G912 actual value determination for in-
process measurement“
■ V300: Result of “G991 controlled parting“
Examples for “V variables”
. . .
N.. V{M1[Z]=300} [ Sets “machine dimension 1 Z“ to “300“ ]
. . .
N.. G0 Z{M1[Z]} [Moves to “machine dimension 1 Z” ]
. . .
N.. IF{E1[1]==0} [Interrogates “external event 1 – bit 1“]
. . .
N.. V{D5[X]=1.3} [Sets “compensation X for tool 5” ]
. . .
N..V{V12=17.4}
N..V{V12=V12+1}
N.. G1 X{V12}
. . .
IF you program branches on the basis of V variables,
there must not be any # variables in the program
branches.