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18 Measurement Functions
158
Fig. 18.1-1
18 Measurement Functions
18.1 Skip Function (G31)
Instruction
G31 v (F) (P)
starts linear interpolation to the point of v coordinate. The motion is carried on until an external skip
signal (e.g. that of a touch-probe) arrives or the control reaches the end-point position specified at
the coordinates of v. The control will slow down and come to a halt after the skip signal has arrived.
Address P specifies which skip signal input is to be used during movement of the 4 ones available in
control:
P0: uses skip signal 1
P1: uses skip signal 2
P2: uses skip signal 3
P3: uses skip signal 4
If address P is not specified, control takes skip signal 1.
G31 is a non-modal instruction applicable only in the particular block, in which it has been
programmed. The control returns error message 3051 G22, G28, ... G31, G37 if a syntactic error
is found in instruction G31.
The speed of motion is
– the specified or modal value F if parameter SKIPF=0
– the feed value taken from G31FD if parameter SKIPF=1.
In the instant the external signal arrives, the
positions of axes will be stored in the system
variables specified below.
#5061.........position of axis 1
#5062.........position of axis 2
.
.
#5068.........position of axis 8
The position stored there is
– the position assumed in the instant the external signal (if any) has arrived,
– the programmed end-point position of interpolation G31 (unless an external signal has arrived),
– to be understood invariably in the current work coordinate system,
– with the actual length compensation (G43, G44) and
– with the actual tool offset (G45 ... G48) taken into account.
The motion comes to a halt with linear deceleration after the external signal has arrived. Now the
end-point position of interpolation G31 is slightly different from the positions stored in variables
#5061... on arrival of the signal, the difference varies with the feed applied in the interpolation. The
end-point positions of the interpolations are accessible in variables #5001... . The next interpolation
will be effective from those end-point positions on.