Mitsubishi A1SD75M3

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MELSEC-A
8 ZERO POINT RETURN CONTROL
8.4 Positioning to the zero point
Positioning to the zero point is explained in this section.
To carry out positioning to the zero point, "1-axis linear control (ABS) positioning data"
is created in which the "
Md.43 Zero point absolute position" is set in the positioning
address (
Da.5
). In this case, the other positioning data items are set beforehand in
the flash ROM. (This control is called a "high-speed machine zero point return".)
Restrictions
The "zero point absolute position overflow/underflow flags" (
Md.40 Status:
b11/b12) must be turned OFF.
Positioning data setting example
The following table shows setting examples in which "zero point positioning" is set
in the positioning data No. 100 of axis 1.
Setting item
Setting
example
Setting details
Da.1
Operation pattern
Positioning
complete
Set "Positioning complete" so the next positioning data is not executed.
Da.2
Control method ABS linear 1 Set the absolute system 1-axis linear control.
Da.3
Acceleration time No. 0
Designate the value set in "
Pr.8
Acceleration time 0" 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
Set "
Md.43
Zero point absolute position" in the positioning address.
(Assuming that the "
Pr.1
Unit setting" is set to "mm".)
Da.6
Arc address – Setting not required. (Setting value will be ignored.)
Da.7
Command speed 20.00mm/min Set the speed when moving to the positioning address.
Da.8
Dwell time 500ms
Set the time from the positioning stop (position command output stop)
to the output of the positioning complete signal.
Axis 1 Positioning data No. 1
Da.9
M code 0
Set when carrying out other auxiliary operation commands in
combination with the No. 1 positioning data
* Refer to section "5.3 List of positioning data" for information on the setting details.