46
Operation
Theory
the function and provides information about the velocity profile
and position method to achieve the target position.
X
‘t:’ The velocity profile is ‘Trapezoidal’. That is the accelera-
tion and deceleration is a constant (shown in left diagram).
X
‘s:’ The velocity profile is ‘S-Curve’. This is a derivative of
acceleration, ‘jerk’, and is a constant (shown in right dia-
gram).
X
‘r:’ The axis moves a distance ‘Relative’ from a specified
point. Specified by parameter ‘Dist’.
X
‘a:’ The axis moves to an ‘Absolute’ position regardless of
its current position. It is specified by the parameter ‘Pos’.
Figure 4-3: Single Axis Motion
The distance moved during acceleration and deceleration can be
calculated using the following formula. (For both trapezoidal and
S-curve profiles)
Dist_acc = 0.5 * ( MaxVel) * Tacc
Dist_dec = 0.5 * ( MaxVel) * Tdec
In some cases, the distance moved may not be long enough. For
example, the ‘Dist ‘ in start_tr_move() is too small or ‘Pos’ in
start_sa_move() is too close to the current position. These 4 func-
tion calls mentioned above automatically slows down the velocity.
The change in the velocity profile is illustrated in the diagram
below.
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