
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(a) Manual intervention compensation request signal (MIGET: #1/#2)
[Classification]
Input signal
[Function] This signal indicates a request for manual intervention compensation during automatic op-
eration.
[Operation] When this signal goes high during automatic operation, the control unit compensates for
manual intervention after the current distribution process has been completed and finish sig-
nal FIN (#1/#2), for an M code without buffering, is received.
Upon completion of the compensation process, the control unit outputs manual intervention
compensation finish signal MIFIN (#1/#2). Upon detecting that this signal has gone high, set
signal MIGET low. The control unit sets signal MIFIN low in response to low–state signal MI-
GET. Once this procedure has been completed, the control unit starts reading the next block.
NOTE 1 Select absolute switch signal ABS and set signal MIGET high before returning signal FIN for
an M code without buffering.
NOTE 2 Keep signal MIGET low while the control unit is in the reset state or has just started automatic
operation.
NOTE 3 Alarm PS059 occurs if signal MIGET goes high when there is no M code without buffering (the
block has already been read).
(b) Manual intervention compensation finish signal (MIFIN: #1/#2)
[Classification]
Output signal
[Function] This signal indicates that manual intervention compensation has been completed during au-
tomatic operation.
[Output Condition]
This signal goes high when the manual intervention compensation process, activated by sig-
nal MIGET, has been completed. Upon detecting that signal MIGET has gone low, the control
unit sets signal MIFIN low.
2.3.13 Reference position return
Manual reference position return is performed using one of the following methods:
– Grid method: The reference position is determined based on an electric grid which is formed using the
one–rotation signal from a position detector.
– Using a magnetic switch: The reference position is determined as the point at which a proximity
switch mounted on the machine is turned on.
The signals related to manual reference position return inthese methods are listed below:
Grid system Magne switch system
Mode selection J
Reference point return selection ZRN, MZRN
Selection of an axis to move
+J1, –J1, +J2, –J2, +J3, –J3,…
Selection of a moving direction
Selection of a feedrate ROV1, ROV2
Deceleration signal DEC1, DEC2, DEC3,…
Reference point proximity signal ZD1, ZD2, ZD3,… (None)
Reference point arrival signal (Grid of each axis) ZD1, ZD2, ZD3,…
Reference point return end signal ZP1, ZP2, ZP3,…
Manual reference position return is performed using the signals listed above in the following procedure:
(1) Select the continuous manual feed mode (J), and set the manual reference position return selection signal
(ZRN) high.
(2) Feed a target axis toward the reference position by making an appropriate feed axis direction selection
signal (+J1, –J1, +J2, –J2, ...) high.