1028 HEIDENHAIN Technical Manual MANUALplus 620
The NC stores the status information on spindle positioning in the following
PLC operands.
Tapping The NC puts the spindle in the position control loop during tapping and thread
cutting (Cycle 18 for TNC controls). Please be aware that the spindle is
position-looped (NN_SpiControl = 1) even for tapping with a floating tap holder
(Cycle 2). The job is not transmitted by the PLC.
The NC shows in the following PLC operands that a tapping operation is
currently being executed (both markers are set simultaneously).
PLC operand / Description Ty p e
NN_SpiControl
Spindle in position control loop
0: Spindle is not in position control loop
1: Spindle is in position control loop
M
NN_SpiControlInPos
Spindle in position
0: Spindle is not in position
1: Spindle is in position
M
PLC operand / Description Ty p e
NN_SpiTapping
Tapping active
0: Tapping not active
1: Tapping active
M
NN_SpiRigidTapping
Tapping with spindle interpolated with Z axis active
0: Tapping not active
1: Tapping active
M
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