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APPENDICES
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 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
A
Slit disk
B
Z
Phototransistor
Rotating axis
1
4
Zero signal
Output waveform 2-phase + OP output
Light-emitting diode
Zero signal slit
1 pitch
A
pitch
B
1 pulse per axis rotation
Appendix - 78
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INCREMENTAL 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-
feed, etc. Compare ABSOLUTE SYSTEM.
No.1
Stop
0
0
Right
Right No. 2 is several millimeters
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-Q
No.2
No.3
0
Left
to the right of No. 1.
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