S-Curve Ratio - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

S-curve ratio

S-curve ratio can be set as the acceleration/deceleration processing method for S-curve acceleration/deceleration
processing.
(Refer to S-curve acceleration/deceleration processing (Page 266 S-curve acceleration/deceleration processing) for S-
curve acceleration/deceleration processing.)
Setting range of the S-curve ratio is 0 to 100[%].
If it is set outside the range, an error occurs at the start and control is executed with the S-curve ratio set as 0[%] (Trapezoidal
acceleration/deceleration).
Errors are set in the "Latest self-diagnosis error (SD0)".
Setting of the S-curve ratio enables acceleration/deceleration processing to be executed gently.
The graph for S-curve acceleration/deceleration is a sine curve as shown below.
V
Positioning speed
0
Acceleration
time
As shown below, the S-curve ratio setting serves to select the part of the sine curve to be used as the acceleration/
deceleration curve.
A
B
B/2
S-curve ratio = B/A × 100[%]
3 PARAMETERS FOR POSITIONING CONTROL
220
3.13 Parameter Block
Sine curve
Deceleration
time
Positioning speed
B/2
Positioning speed
Sine curve
t
Time
V
A
B
B/A = 1.0
S-curve ratio is 100[%]
V
B
B/A = 0.7
A
S-curve ratio is 70[%]
t
t