System philosophy
HARDWARE REFERENCE MANUAL
17
Revi
si
on 3.0
2.2.1
PTP control
In point-to-point positioning, each axis is moved independently of
the other axis. The TJ1-MC__ supports the following operations:
•
Relative move
•
Absolute move
•
Continuous move forward
•
Continuous move reverse.
Relative and absolute moves
fig. 3
To move a single axis either the command
MOVE
for a relative
move or the command
MOVEABS
for an absolute move is used.
Each axis has its own move characteristics, which are defined by
the axis parameters.
Suppose a control program is executed to move from the origin to
an axis no. 0 (A) coordinate of 100 and axis no. 1 (B) coordinate of
50. If the speed parameter is set to be the same for both axes and
the acceleration and deceleration rate are set sufficiently high, the
movements for axis 0 and axis 1 will be as shown in the figure.
At start, both the axis 0 and axis 1 moves to a coordinate of 50 over
the same duration of time. At this point, axis 1 stops and axis 0
continues to move to a coordinate of 100.
The move of a certain axis is determined by the axis parameters.
Some relevant parameters are:
/i
0
50
50
100
A
B
MOVEABS(100) AXIS(0)
MOVEABS(50) AXIS(1)
Parameter
Description
UNITS
Unit conversion factor
ACCEL
Acceleration rate of an axis in units/s
2
DECEL
Deceleration rate of an axis in units/s
2
SPEED
Demand speed of an axis in units/s
2
I51E-EN-03.book Seite 17 Donnerstag, 28. Juni 2007 1:05 13