Positioning To The Zero Point - Mitsubishi Electric AJ65BT-D75P2-S3 User Manual

8 ZERO POINT RETURN CONTROL

8.5 Positioning to the zero point

Setting item
Operation pattern
Da.1
Control method
Da.2
Acceleration time No.
Da.3
Deceleration time No.
Da.4
Positioning address/
Da.5
movement amount
Arc address
Da.6
Command speed
Da.7
Dwell time
Da.8
M code
Da.9
* Refer to section "5.3 List of positioning data" for information on the setting details.
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".)
The " Pr.47 Zero point address" is a fixed value set by the user, but the " Md.43 Zero
point absolute position" is constantly changed by the D75P2 to indicate the "zero
point", even if there is a change in the address information.
Restrictions
Md.43 Zero point absolute position is not modified in following cases.
 Feeding actual value 0 clear when starting fixed dimensions feeding. (Refer to
section 9.2.4 and 9.2.5)

Feeding actual value 0 clear when controlling speed. (Refer to section 9.2.8)
 Updating feeding actual value when controlling speed. (Refer to section 9.2.8)
The "zero point absolute position overflow flags" (RX(n+2)3, RX(n+5)3) and the
"zero point absolute position underflow flags" (RX(n+2)4, RX(n+5)4) 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
example
Positioning Set " Positioning complete " so the next positioning data is not
complete executed.
ABS linear 1 Set the absolute system 1-axis linear control.
Designate the value set in " Pr.8 Acceleration time 0" as the
0
acceleration time at start.
Designate the value set in " Pr.9 Deceleration time 0" as the
0
deceleration time at deceleration.
Set " Md.43 Zero point absolute position" in the positioning address.
(Assuming that the " Pr.1 Unit setting" is set to "mm".)
– Setting not required. (Setting value will be ignored.)
20.00mm/min Set the speed when moving to the positioning address.
Set the time from the positioning stop (pulse output stop) to the output
500ms
of the positioning complete signal.
Set when carrying out other auxiliary operation commands in
0
combination with the No. 1 positioning data
Setting details
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MELSEC-A