Appendix 8 Glossary - Mitsubishi Electric FATEC MELSEC iQ-R Training Manual

Appendix 8 Glossary

A
Absolute encoder
This is a detector that allows angular data
contained in a single motor rotation to be
output externally, and standard encoders
allow 360 degrees to be extracted in 18 to 22
bits.
With incremental encoders, the axis position
when a power outage occurs is lost,
however, with absolute encoders, the axis
position is retained, even in the event of a
power outage.
Absolute encoders of various output types,
such as binary code and BCD code types,
are available. They are more expensive and
have higher accuracy than incremental
encoders.
Slit disk
Photo transistor
Rotational
axis
Absolute position detection system
If the machine is once returned to the home
position when it is started up during
positioning, the machine position is stored in
the positioning module, and its current
position is maintained even if the power
supply is turned off. Machine displacements
are compensated. Consequently, there is no
need to perform home position return after
restoring the power. This system
configuration requires a motor with absolute
position detector, a servo amplifier
compatible with the absolute positioning
system and a positioning module.
Fixed slit
LED
0
2
1
2
3
2
4
2
2 4
2 3
2 2
2 1
2 0
Binary code
Absolute system
This is a method used to express the
positioning address.
This is an absolute address method.
This method expresses the distance from the
reference 0.
The positioning direction is determined
automatically without being specified. There
is also an incremental mode.
0 No. 1
Automatic trapezoidal acceleration/
deceleration
This is a movement in which the time and
speed graph forms a trapezium.
Acceleration
Speed
C
Composite speed
Moving speed of control object during
interpolation operation. It is computed by
vector calculation of X-axis and Y-axis
speed.
Y-axis
speed
App-70
No. 2 No. 3
Deceleration
Time
Vector Speed
X-axis speed