FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–62764EN/01
250
2. Using no miscellaneous functions
By setting to bits 2, 3, and 4 of parameter ABS, INC,G90 No.5500,
operation can be selected from the following two options.
Select the operation by referring to the manual written by the machine
tool builder.
(1)Rotating in the direction in which an angular displacement
becomes shortest
This is valid only in absolute mode. A specified angular
dis–placement greater than 360
° is rounded down to the
correspond–ing angular displacement within 360
° when bit 2 of
parameter ABS No.5500 specifies this option.
For example, when G90 B400.0; is specified at a position of 0, the
table is rotated by 40
°in the positive direction.
(2)Rotating in the specified direction
In the absolute mode, the value set in bit 2 of parameter ABS
No.5500 determines whether an angular displacement greater than
360
° is rounded down to the corresponding angular displacement
within 360
°.
In the incremental mode, the angular displacement is not rounded
down.
For example, when G90 B720.0; is specified at a position of 0, the
table is rotated twice in the positive direction, when the angular
displacement is not rounded down.
The table is always rotated around the indexing axis in the rapid traverse
mode.
Dry runs cannot be executed for the indexing axis.
WARNING
If a reset is made during indexing of the index table, a
reference position return must be made before each time
the index table is indexed subsequently.
NOTE
1 Specify the indexing command in a single block. If the
command is specified in a block in which another controlled
axis is specified, P/S alarm (No.136) occurs.
2 The waiting state which waits for completion of clamping or
unclamping of the index table is indicated on diagnostic
screen 12.
3 The miscellaneous function specifying a negative direction
is processed in the CNC.
The relevant M code signal and completion signal are sent
between the CNC and the machine.
4 If a reset is made while waiting for completion of clamping
or unclamping, the clamp or unclamp signal is cleared and
the CNC exits the completion wait state.
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