8 Pulse Outputs
8-28
CJ2M CPU Unit Pulse I/O Module User’s Manual
z Positioning with S-curve Acceleration/Deceleration
With the S-curve acceleration/deceleration positioning, shock and vibration can be controlled by
reducing the initial acceleration rate in comparison with a trapezoidal acceleration/deceleration rate.
This can be selected when there is some leeway in the maximum allowable speed.
Additional Information
• The same type of S-curve acceleration/deceleration can be used for ACC(888) as well.
• The curve for S-curve acceleration/deceleration is formed by applying a tertiary function to the
straight line of the set acceleration/deceleration rates (a tertiary polynomial approximation).
The curve parameters cannot be changed. The maximum acceleration will be 1.5 times that of
trapezoidal acceleration/deceleration for the same acceleration/deceleration rate.
Precautions for Correct UsePrecautions for Correct Use
• If the starting frequency is set to less than 100 pps, it will automatically be increased to
100 pps.
• S-curve acceleration/deceleration will not be performed if the target frequency is less than
100 pps.
z Selecting Relative or Absolute Coordinates
The coordinate system (absolute or relative) of the pulse output PV is selected automatically, as fol-
lows:
• When the origin is undefined, the system operates in relative coordinates.
8-2-2 Relative Positioning and Absolute Positioning
100 pps
50 pps
Automatically
increased to
100 pps.
Pulse frequency
Time
50 pps
No
acceleration/deceleration
Pulse frequency
Time
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