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MELSEC-
A
9 MAIN POSITIONING CONTROL
Restrictions
An error will occur and the positioning will not start in the following cases. The
machine will immediately stop if the error is detected during a positioning control.
If the movement amount of each axis exceeds "1073741824 (=2
30
)" at the
setting of "0: Composite speed" in "
Pr.21 Interpolation speed designation
method"
An error "outside linear movement amount range" (error code: 504) will occur
at the positioning start.
(The maximum movement amount that can be set in "
Da.5
Positioning
address/movement amount" is "1073741824 (=2
30
)"
Positioning data setting example
The following table shows setting examples when "2-axis linear interpolation
control (ABS linear 2)" is set in positioning data No. 1 of axis 1. (The required
values are also set in positioning data No. 1 of axis 2.)
Axis
Setting item
Axis 1
(reference
axis) setting
example
Axis 2
(interpolation
axis) setting
example
Setting details
Axis 1 Positioning data No. 1
Da.1
Operation pattern
Positioning
complete
–
Set "Positioning complete" assuming the next positioning
data will not be executed.
Da.2
Control method ABS linear 2 – Set absolute system 2-axis linear interpolation control.
Da.3
Acceleration time
No.
1 –
Designate the value set in " Pr.26 Acceleration time 1" as
the acceleration time at start.
Da.4
Deceleration time
No.
0 –
Designate the value set in "
Pr.9 Deceleration time 0" as
the deceleration time at deceleration.
Da.5
Positioning address/
movement amount
10000.0
m 1000.0
m
Set the end point address. (Assuming "mm" is set in
" Pr.1 Unit setting".)
Da.6
Arc address – – Setting not required (setting value will be ignored).
Da.7
Command speed
6000.00
mm/min
– Set the speed during movement to the end point address.
Da.8
Dwell time 500ms –
Set the time the machine dwells after the positioning stop
(pulse output stop) to the output of the positioning complete
signal.
Da.9
M code 10 –
Set this when other auxiliary operation commands are
issued in combination with the No. 1 positioning data.
* Refer to section "5.3 List of positioning data" for information on the setting details.
POINT
The speed limit does not function for the speed calculated by the D75P2 during
interpolation control. Because of this, observe the following precautions when
setting the speed.
When the "composite speed" is set, set a value so the speed for each axis does
not exceed the "
Pr.7 Speed limit value".
When the "reference axis speed" is set, set so the major axis side becomes the
reference axis. If the minor axis side is set as the reference axis, the major axis
side speed may exceed the "
Pr.7 Speed limit value".