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MELSEC-Q
9 MAJOR POSITIONING CONTROL
9.2.14 3-axis speed control
In "3-axis speed control" (" Da.2 Control system" = Forward run: speed 3, Rever se
run: speed 3), control is carried out in the 3-axis direction in which the positioning data
has been set by continuously outputting puls es for the speed set in " Da.8 Command
speed" until the input of a stop command.
The two types of 3-axis speed control are "F orward run: speed 3" in which the control
starts in the forward run direction, and "R everse run: speed 3" in which control starts in
the reverse run direction.
(Refer to Section 9.1.6 "Interpolation control " for the combination of the reference axis
with the interpolation axes.)
Operation chart
The following chart shows the operation timing for 3-axis (axes 1, 2, and 3) speed
control with axis 1 as the reference axis.
The "in speed control" flag ( Md.31 Status: b0) is turned ON during spee d control.
The "positioning complete signal" is not turned ON.
t
V
BUSY signal
[XC,XD,XE]
OFF
ON
Positioning start signal
[Y10]
OFF
ON
Positioning complete signal
[X14,X15,X16]
OFF
Axis stop signal
(stop command)
(Either Y4,Y5 or Y6)
OFF
ON
Does not turn ON even
when control is stopped
by stop command.
Status: b0 OFF
ON
Md.31
In speed control flag
Da. 8 Referense axis (axis 1)
t
V
Da. 8 Interpolation axis (axis 2)
t
V
Command speed
Da. 8 Interpolation axis (axis 3)
Command speed
Command speed
Fig. 9.11 3-axis speed control operation tim ing