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Functions
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Festo – GDCP-CMMP-M3-FW-EN – 1203NH
The positioning records can be addressed via digital inputs, fieldbus or the parameterisation software
FCT.
Absolute positioning linear/rotative axis
Here, the positioning target is moved to regardless of the current position. With absolute positioning
the target position is a fixed (absolute) position relative to the zero point or reference point.
Absolute positioning, modulo axis
The target position of the positioning record is travelled to with modulo correction. Example: 490°
for modulo 360, the axis is positioned to 130°.
Relative positioning, linear/rotative axis
With relative positioning, the target position is obtained by adding a value to the current position. Ref-
erencing is necessary to bring the drive into a defined position.
Concatenation of relative positioning can be used to continuously position in the same direction, such
as for a trimming unit or conveyor (incremental dimensions). The following options are available:
–
Relative reference to the last target position
–
Relative reference to the current position (actual position)
Relative positioning, modulo axis
The target position of the positioning record is not travelled to with modulo correction. Example: 490°
, the axis travels positively around 490°.
Positioning with analogue setpoint
The target position is determined through the analogue setpoint specification at AIN0 [X1]. The follow-
ing options are available:
–
Absolute reference to the project zero point
–
Relative reference to the last target position
–
Relative reference to the current position
–
Continuous positioning corresponding to the analogue setpoint specification (joystick function)
Speed
The maximum speed at which movement to the position is to take place.
Acceleration
Setpoint value of acceleration for the positioning record.
Deceleration
Setpoint value of the positioning record deceleration.
Smoothing
With travel profiles, a distinction is made between time-optimised and jerk-limited positioning. With
time-optimised positioning, motion occurs with the maximum specified acceleration and braking. The
drive moves to the target in the shortest possible time, the speed sequence is trapezoidal and the ac-
celeration sequence square. With jerk-limited positioning, the acceleration is trapezoidal and the speed
curve is third-order. Since the acceleration constantly changes, the drive moves in a manner that is
especially gentle to the mechanics.
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