YASKAWA yasnac lx3 - Page 153

c.
d.
To supplement the above description, the
following discriminants for determination
of the circular arc cutting directions in the
control unit are provided:
Values of
I and K
Commands
120. K20
120, K<0
—
1<0, K20
I<o, K<O
Table 2.42
Circular
Arc Rotational Direction
Circular =c in
1
Circular arc in
turning facing
Counterclosk
Clwkwise (CW)
wise (CCW)
(Equivalent to
(Equivalent to
~~r;;~
CINkwise ‘Cw) ‘ wise (CCW)
(Equivalent to
G 02)
(Equivalent to
G 03)
Counterclock
Clockwise (CW)
wise (CCW)
(Equivalent to
(Equivalent to
G 03)
G 02)
When a negative value is specified for the
circular arc R, the circular arc cutting
direction mentioned above may be inverted
as follows:
CIRCULAR ARC ROTATIONA1
OIRECTION WITH POSITIVE
VALUE SPECIFIED FOR R
J
-x
,L
COUNTERCLOCKWISE
WHEN I< O,K<O
CLOCKWISE WHEN
I< O,K<O
J---
CIRCULAR ARC ROTATIONAL
DIRECTION WITH NEGATIVE
VALUE SPECIFIED FOR R
+Z
Address words X(U) and Z(W) are used to
make discrimination between radius measur–
in g circular arc and front circular arc .
They cannot be omitted if the end point and
the start point are on the same coordinates
(“UO” or “WO” should be specified) . When
the address words other than X (U) and
Z (W) are omitted, the following results are
obtained:
Address
Word
I
1.
2.
3.
4.
5.
6.
7.
K
R
P
Q
c
D
Notes :
Table 2.43
Result
“1O command is provided.
“K O command is provided.
“R O“ command and alarm are provided.
“0 command is provided. Beveling and
rounding are not performed.
G 112.is a nonmodal G code and is valid onlv
for the specified block.
-,
The block specified with G112 does not allow
the specificationof M, S , and T .
When G 112 block is executed on a single
block basis, the movement up to the end
point is performed assuming the maximum of
four blocks.
When G 112 is used for the finishing shape
blocks G71 (stock removal cycle in turning) ,
G72 (Stock removal cycle in facing) , and G73
(pattern repeating) of multiple repetitive
cycles the block specified with G112 is
equiva-
lent to five blocks.
Do not specify other codes to the G 112’block;
otherwise, an error willbe caused.
After wiring G 112 block to the buffer, the
control unit performs allcomputations for the
straight line,
the circular arc, and the first
and second beveling and rounding. For some
contours, the computation time becomes more
than 500 msec.
If the move time in the pre-
ceding block is shorter than the computation
undesirable effects on the cutting surface.
To prevent the stop of movement due to the
computation time, provide the buffering state
(M93 command) before the four blocks before
specifying B 112 block command.
List of alarms to be given by G112 command
error
Alarm
Code
Cause
I
145 I X(U) or.Z(W) not specified
145 I Both X(U) and Z(W) specified.
145
-k
R not specified. Or “O” specified.
14.5 I and K not specified. Or “O” specified for both.
145