
B–63523EN–1/03
15. PMC CONTROL FUNCTION
1795
The reference position return command (EC0g to EC6g: 05h) enables the
following operation: When DLZ, bit 1 of parameter No. 1002, specifying
reference position return without dogs for all axes, or DLZx, bit 1 of
parameter No. 1005, specifying reference position return without dogs for
each axis, is valid and the tool has not been returned to the reference
position since the power was turned on, move each axis in the direction
specified by the continuous feed command (EC0g to EC6g: 06h)
(position the tool to a point near the reference position) and issue the
reference position return command (EC0g to EC6g: 05h). This returns
the tool to the reference position (positions the tool to the grid nearest the
current position) without using the deceleration signal for reference
position return.
Note that, when positioning the tool to a point near the reference position,
the tool must be moved in the direction of reference position return at such
a speed that the servo position error exceeds the value of parameter No.
1836.
The direction of the grid relative to the proximate position depends on
ZMIx, bit 5 of parameter No. 1006.
After the reference position has been established, reference position
return can be performed at high speed by issuing the reference position
return command (EC0g to EC6g: 05h), irrespective of the reference
position return direction specified by ZMIx, bit 5 of parameter No. 1006.
When using the 1st reference position return command (EC0g to EC6g:
07h), if DLZ, bit 1 of parameter No. 1002, specifying reference position
return without dogs for all axes, or DLZx, bit 1 of parameter No. 1005,
specifying reference position return without dogs on a per–axis basis is
valid and the tool has not been returned to the reference position since the
power was turned on, issuing the 1st reference position return command
(EC0g to EC6g: 07h) results in the issue of a P/S alarm (No. 090).
When using the 1st to 4th reference position return commands (EC0g to
EC6g: 07h to 0Ah), the feedrate can be specified using RPD, bit 0 of
parameter No. 8002, in the same manner as when using the rapid traverse
command (EC0g to EC6g: 00h).
Note that, in the case of the 1st reference position return, if the tool has
not been manually returned to the reference position after the power was
turned on, the feedrate specified by parameter No. 1424 applies.
When using the external pulse synchronization commands (EC0g to
EC6g: 0Bh, 0Dh to 0Fh), the tool moves backwards if the external pulse
has a negative value. When a manual handle interrupt is executed for the
axis to which the external pulse is being applied, the moving distance is
the sum of the external pulse and the interrupt pulse.
When a serial spindle is used, synchronization with the main spindle
(EC0g to EC6g: 0Bh) is not possible.
When using the continuous feed command (EC0g to EC6g: 06h) and the
external pulse synchronization command (EC0g to EC6g: 0Bh, 0Dh to
0Fh), the displayed remaining distance is always “0”.
Reference without dogs
position return
First reference position
return for an incomplete
reference position return
without dogs
1st to 4th reference
position return
External pulse
synchronization
Display of remaining
distance