Mitsubishi Electric MELDAS C6 Interface Manual page 227

B con-
Signal name
tact
REFERENCE POINT
—
RETURN MODE
[Function]
REFERENCE POINT RETURN mode is selected.
"Reference point return" is that axis motion component (tool, table, etc.) is returned to the position
previously determined for individual machine.
[Operation]
The reference point return mode is selected when the reference point return mode signal (ZRN) is
turned ON.
Select the reference point return mode, and turn ON the designated feed axis select signal
(+J1~+J14, -J1~-J14) to return to the reference point.
If the operation mode duplicates the other mode or if it is removed, the NC alarm "M01
OPERATION ERROR 0101" will occur.
The first reference point return after the controller power is turned ON is the dog-type return
(excluding when the basic machine coordinate system is established for the absolute position
detection specifications). After the second manual reference point return (when basic machine
coordinate system is established), the dog-type or high-speed return is selected with the setup
parameters, base specification parameter "#1063 mandog".
(1) Dog-type reference point return pattern
The return pattern is determined by the final entry method of the setup parameter zero point
return.
1) Operation when axis is moved in same
direction as the final entry method,
and dog is tripped.
Near-point dog
• After the near-point dog is detected and the approach speed is applied, the axis will move to
the reference point even if the feed axis select signal is turned OFF. Thus, after the approach
speed is applied, another axis can be switched to and reference point return executed.
• The entry direction (final entry direction) after the near-point dog is tripped is set with
parameters.
• The feedrate before the approach speed is the zero point return feedrate if the feedrate
signal (RT) is ON, and the manual feedrate (*JV1~*JV16) is OFF.
• The approach speed is set with the parameters.
• When the reference point is reached, the movement will stop even if the feed axis select
signal is ON, and the 1st reference point reached signal (ZP1n) will turn ON.
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
ZRN
Parameter's final
entry method
Reference point
6-3-30
1st system 2nd system
Y704 Y7E4
2) When axis is moved in opposite
direction from final entry method,
and dog is tripped.
Near-point dog
3rd system
Y8C4
Parameter's final
entry method
Reference point