Chapter 5: MEI Software
33
Figure 5-7. The Configure/Axis Dedicated I/O Window
5.1.3.4 Motion Menu
The
Motion
menu contains the options:
Option Description
Point to Point Motion
Is used to command an axis to move between two points
Graphics Mode
Displays the command vs. actual and analog output for a move
Point to Point Motion Window
This window is used to command motion between two points. Point 1 and Point 2 specify the
endpoints of the motion, Velocity specifies the maximum slew speed and Acceleration the
acceleration rate. The jerk field is only used when performing non-constant acceleration profiles
(S-curve and parabolic). Units are encoder counts (steps), counts (steps) per second, counts
(steps) per second
2
and counts (steps) per second
3
.
The G
O
button is used to start the motion. The
Repeat
and
End Repeat
fields may be used to
start or stop repetitive motion. The E-S
TOP
field is used to trigger an E-Stop event. Use the
cursor to move between fields and buttons, and the Space Bar or <Enter> to "push" a button.
Three motion profiles are available: trapezoidal, parabolic and S-curve. Generally, choose an
acceleration that is 10 times the velocity and a jerk that is 100 times the acceleration.
Remember, that the velocity is the rate of change of the position, acceleration is the rate of
change of the velocity, and the jerk is the rate of change of the acceleration. Note that increasing
the velocity and acceleration of parabolic and S-curve moves can actually increase the time to
position.
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