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MELSEC-
A
9 MAIN POSITIONING CONTROL
9.2.8 Speed control
In "speed control"(" Da.2 Control method" = Forward run: speed control, Reverse
run: speed control), control is carried out in the axis direction in which the positioning
data has been set by continuously outputting pulses for the speed set in "
Da.7
Command speed" until the input of a stop command.
The two types of speed control are "Forward run: speed control" in which the control
starts in the forward run direction, and "Reverse run: speed control" in which control
starts in the reverse run direction.
Operation chart
The following chart shows the operation timing for speed control. The "in speed
control flag" (RX(n+1)C, RX(n+4)C) is turned ON during speed control.
t
V
BUSY signal
OFF
ON
Positioning start signal
OFF
ON
Positioning complete signal
OFF
Stop command
OFF
ON
Does not turn ON even
when control is stopped
by stop command
OFF
ON
In speed control flag
Da. 7 Command speed
[RY(n+1)0, RY(n+1)1]
[RXn4, RXn5]
[RXn7, RXn8]
[RX(n+1)C, RX(n+4)C]
Fig. 9.9 Speed control operation timing