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9
MAIN POSITIONING CONTROL
9.2.8 Speed control
Da. 7 Command speed
Positioning start signal
[RY(n+1)0, RY(n+1)1]
BUSY signal
Positioning complete signal
Stop command
In speed control flag
[RX(n+1)C, RX(n+4)C]
In "speed control"(" Da.2
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.
V
ON
OFF
OFF
[RXn4, RXn5]
OFF
[RXn7, RXn8]
OFF
OFF
Fig. 9.9 Speed control operation timing
Control method" = Forward run: speed control, Reverse
ON
ON
9 - 46
MELSEC-A
t
Does not turn ON even
when control is stopped
by stop command
ON
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