Mitsubishi Electric MELDAS C6 Interface Manual page 258

B con-
Signal name
tact
REFERENCE POINT
—
RETRACT
[Function]
This function returns immediately to a set reference point when the retract signal is input. This
function is used to return to a set position for changing the tool.
[Operation]
Reference point return is executed when this signal is turned ON. At the rising edge of the signal,
the program is automatically reset (reset & rewind) and then reference point return is executed.
During the automatic or MDI operation, the operation is interrupted and stopped by the reset, and
reference point return is executed.
If this signal is input during execution of a tap cycle in the automatic or MDI operation modes, the
"Tap retract possible" signal will be output by the reset interruption, and the retract operation will be
the tap retract operation. The tap retract is completed at the initial point, and after that the reference
point return will be carried out.
(1) If there are two or more axes, set the retract order with parameter (#2019 revnum).
(2) When the reference point is reached, the corresponding "Reference point reached" signal will
be output.
(3) This signal must be held until the "Reference point reached" signal is output. If it is turned OFF
midway, the return operation will be interrupted and stop. If the signal is input again, the
operation will restart from execution of resetting.
(4) The reference point return speed is handled in the same manner as the normal reference point
return speed.
(5) The reference point returned to by "Reference point retract" depends on the Y730 and Y731
zero point position selection.
(6) Even if the retract signal is input during the thread cutting cycle, it will be invalid. However, if the
retract signal is executed in a block other than the thread cutting block, the return operation will
be executed.
(7) The retract signal is invalid if the coordinate system is not established. An operation error will
occur when the retract signal is input. (M01 OPERATION ERROR 0020)
[Time chart]
Reference point retract
(RTN)
In reset
(RST)
Automatic operation
Reference point reached
(ZP1n)
[Related signals]
Tap retract possible (TRVE: X66D)
Tap retract (TRV: Y75C)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
RTN
Approx.
100ms
Reset stop
6-3-61
1st system 2nd system
Y75D Y83D
Reference point return
3rd system
Y91D