GSK GSK983Ma, User Manual

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Chapter Three Programming
193
Part 1 Programming
3.12.5 JOG/Step/MPG
Operations in Jog/Step/MPG mode cannot be performed for Axis B. However it may return to the
reference point in Jog mode. Travel stops once the axis selection signal becomes “0” when manually
returning to the reference point. Clamping instruction is not performed. In order to avoid the problem,
set the sequence program on the machine side so that the axis selection signal will not become “0”
before returning to the reference point.
3.12.6 Other Cautions
(1) The indication of the actual position on the screen of LCD, indication of external position and
the indication on the screen of COMND have a decimal point.
For example: B180.000
(2) Whether the absolute coordinate value inside the NC of the B axis is used the 360° full circle
which is set by the BIT4 (IRND) of the parameter 314.
(i) when IRND
＝
0, absolute coordinate is rounded to 360° and starts from 0° position. If G90
B720; is specified, Axis B rotates by 720° (2 turns) and the actual position indication and absolute
coordinate is 720°.
(ii) When IRND ＝ 1, absolute coordinate and the actual position are rounded to 360°. However
the rounding of absolute coordinates is performed after the travel for increment determination. That is,
if G90 B720; is specified from 0° position, Axis B will rotate by 720° (2 turns) and absolute coordinate
will be 0°. Now the actual position changes as follows:
0° 90° 180° 270° 0° 90° 180° 270° 0°
。
The result of 360° rounding, absolute coordinates and actual position are displayed between 0°
and 359°.
For the RELATIVE in the display of the actual position (ABSOLUTE RELATIVE), rounding is only
performed when parameter No. 007 PPD
＝
1.
No matter it is in the condition of (i) or (ii), the mechanical coordinate system often uses 360° for
rounding. When automatic return to the reference point is specified, (G28) calculates the amount of
movement with the mechanical coordinate system. The movement between the intermediate point
and reference point is less than 360° (on turn).
(3) The following description can be gained by the BIT7 (IM15) of the parameter 314.
When IM15
＝
1:
(i) Axis B instruction shall be always considered as absolute instruction regardless the G90 or
G91 mode.
(ii) The rotating direction is positive.
(iii) When M15 is pacified in the same block as the Axis-B instruction, the rotating direction is
negative.
Note:
Though M15 is processed inside the NC, FIN signal returns to the NC because MF and M
codes are sent to the machine side.
(4) During the movement of Axis B, Feedrate, reset and emergent stop are valid. Proper