Siemens SINUMERIK 840C - Manual (Page 310)

12.93 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.2 Spindle-specific MD bits (spindle bits)
Bit 2 Bit 2=1 Must be set when a function calling for a spindle encoder is required, e.g.
• G33/34/35 (Thread cutting)
• G 95 (Feedrate per revolution)
• G 96 (Constant cutting speed)
• G 97 (Freeze spindle speed)
• M 19 (Oriented spindle stop)
The encoder is allocated in MD 400*, which also activates the hardware
monitor for the measuring circuits. If the M19 option is invoked, bit 2 must be
set to 1 (also see Section entitled ”Axis (Analog) and Spindle Installation”).
Bit 1 Bit 1=1 The sign of the spindle encoder pulses is inverted every time this bit changes
its status.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–125
SINUMERIK 840C (IA)