9MAJOR POSITIONING CONTROL

9.2.12 1-axis speed control

MELSEC-Q

In "1-axis speed control" (" Da.2 Control system" = Forward run: speed 1, Reverse

run: speed 1), 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.8 Command

speed" until the input of a stop command.

The two types of 1-axis speed control are "Forward run: speed 1" in which the control

starts in the forward run direction, and "Reverse run: speed 1" in which control starts in the reverse run direction.

Operation chart

The following chart shows the operation timing for 1-axis speed control with axis 1 as the reference axis.

The "in speed control" flag ( Md.31 Status: b0) is turned ON during speed control. The "Positioning complete signal" is not turned ON.

V

Da. 8 Command speed

Positioning start signal [Y10]

t

ON

OFF

ON

BUSY signal

OFF

[XC]

 

Positioning complete signal OFF

 

[X14]

 

ON

Axis stop signal

OFF

(stop command) [Y4]

 

In speed control flag

ON

OFF

Md.31 Status:b0

 

Does not turn ON even when control is stopped by stop command.

Fig.9.9 1-axis speed control operation timing

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Mitsubishi Electronics QD75D, QD75P user manual 12 1-axis speed control