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APPENDICES
TURNTABLE
A rotating table, which is turned using power.
The table is used divided from one 360 °
rotation into the required locations for work.
The positioning control unit is "degree".
Rotated by the motor
UNIT SETTING
This is the setting of the unit for the actual
address to which positioning is required, or for
the movement amount.
The following units can be set: mm, inch,
degree and pulse. The initial value in the
parameters is a pulse unit.
WARNING
A warning is output as a warning code in when
an abnormality is detected that is not serious
enough to require cancellation or stoppage of
the positioning operation. Warnings are
handled differently than errors.
WITH MODE
This is the mode that outputs the M code
before the start of the positioning. This mode
turns ON at the positioning start, enabling
voltage to be applied to the welding
electrodes, display of positioning speeds, etc.
Refer to the term "AFTER MODE".
WORM GEAR
This is the basic screw in mechanisms that
position using screw rotation. Ball screws are
often used to reduce backlash and dimension
error.
1 rotation
by the motor
30°
XY TABLE
This is a device that moves a table in the X
(latitudinal) and Y (longitudinal) directions so
that positioning can be carried out easily.
There are also commercially available
products.
Z PHASE
Also called "PG zero". Refer to "ZERO POINT
SIGNAL".
ZERO POINT
This is the reference position for positioning.
Positioning cannot start without a reference
point.
The zero point is normally set to the upper or
lower stroke limit.
Appendix - 47
Positioning
Lead (feedrate per screw rotation)
X table
Base table
X axis
This point is the reference.
Zero point
MELSEC-A
Worm gear
Y table Ball screw
X table
Y axis
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