
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(7) When the B–axis clamp signal, BCLP, is set high, the B–axis must be mechanically clamped with a clutch
or shot pin by the PMC. After the B–axis is mechanically clamped, the PMC sets the B–axis clamp comple-
tion signal,
*BECLP, low.
(8) When the B–axis clamp completion signal,
*BECLP, goes low, the control unit sets the B–axis clamp signal,
BCLP, low to inform that the
*BECLP signal is received. In procedure B, the B–axis positioning control is
placed in the servo–off state when the B–axis clamp signal, BCLP, is set low.
(9) When the B–axis clamp signal, BCLP, is set low, the PMC sets the B–axis clamp completion signal,
*BECLP, high.
(10)The entire sequence for positioning the index table terminates.
The following timing charts illustrate the procedures.
Timing chart of procedure A for positioning the index table
(1)(2) (3) (4) (5) (6) (7) (8) (9)
B command ( independent ) Bbbbb
Clamp complection signal of B axis *BECLP
Clamp signal of B axis BCLP
B axis rotation
Unclamp completion signal of B axis *BEUCL
Unclamp signal of B axis BUCLP
Servo ON of position control of B axis
Timing chart of procedure B for positioning the index table
(1)(2) (3) (4) (5) (6) (7) (8) (9)
B command ( independent ) Bbbbb
Servo ON of position control of B axis
Unclamp signal of B axis BUCLP
Unclamp completion signal of B axis *BEUCL
B axis rotation
Clamp signal of B axis BCLP
Clamp complection signal of B axis *BECLP
NOTE 1 While an axis is being moved for indexing, input signals that reset the control unit are valid.
For example, the emergency stop signal,
*ESP, external reset signal, ERS, and reset and
rewind signal, RRW, are valid. When the control unit is reset, indexing stops. The automatic
operation halt signal,
*SP, is also valid. When the *SP signal goes low, the axis movement is
stopped and the system enters the automatic operation halt state.
NOTE 2 When the B–axis is positioned, the dry run signal, DRN, is invalid.
NOTE 3 When the B–axis is positioned, the machine lock signal, MLK, is valid. If the machine lock
signal, MLK, goes high while the B–axis is moving, the signal continues to be invalid until the
axis movement terminates.
NOTE 4 For the B–axis, manual operations such as manual continuous feed, incremental feed, and
manual handle feed are not allowed. Only manual reference position return is allowed. If a
reset occurs while the B–axis is being moved, manual reference position return must be
executed. The following timing chart illustrates manual reference position return of the B–axis
in procedure A.
Timing chart of procedure A for manual reference position return of the B–axis
B axis manual feed selection signal +JB *1
B axis position control servo ON
B axis unclamp completion signal *BEUCL
B axis unclamp completion signal *BEUCL
B axis rotation
B axis deceleration signal *DECb
*1
B axis return completion signal ZPb
*1
B axis clamp signal BCLP
B axis clamp completion signal *BECLP
*1: “b” expresses the control axis number of B axis