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APPENDICES
HIGH-SPEED MACHINE ZERO POINT
RETURN
In this zero point return method the near-point
dog is not detected. The positioning data
address is replaced with the machine zero
point address, and the positioning data is
executed to carry out high-speed positioning to
the zero point at a designated speed.
(This is not validated unless a machine zero
point return has been carried out first.)
Positioning data command speed
Near-point dog switch
HIGH-SPEED ZERO POINT RETURN
The axis returns to the machine zero point at
the zero point return speed without detecting
the near-point dog.
(This is not validated unless a machine zero
point return has been carried out first.)
Zero point return speed
Near-point dog switch
INCREMENT SYSTEM
The current value is 0 in this system. Positions
are expressed by the designated direction and
distance of travel. Also called the relative
address system. This system is used in fixed-
dimension feed, etc. Compare ABSOLUTE
SYSTEM.
No.1
Stop
0
0
Right No. 2 is several millimeters
Right
Zero point
Zero point
No.2
No.3
0
Left
to the right of No. 1.
Appendix - 35
INCREMENTAL ENCODER
A device that simply outputs ON/OFF pulses
by the rotation of the axis. 1-phase types
output only A pulses, and do not indicate the
axis rotation direction. 2-phase types output
both A and B pulse trains, and can judge the
rotation direction. The direction is judged to be
forward if the B pulse train turns ON when A is
ON, and judged to be reverse if A turns ON
when B is ON. There is also another type of
incremental encoder with a zero point signal.
The most commonly used incremental
encoders output between 100 and 10,000
pulses per axis rotation. Refer to "ENCODER".
B signal slit
A signal slit
Slit disk
A
Phototransistor
Rotating axis
Zero point signal
Output waveform 2-phase + zero point output
INERTIA
The property of an object, when not being
affected by external forces, where it tries to
maintain its current condition. The inertia
moment.
MELSEC-A
Light-emitting diode
B
Z
Zero signal slit
1 pitch
A
1
pitch
4
B
1 pulse per axis rotation
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