Siemens SINUMERIK 840C - Manual (Page 332)

12.93 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.4 Axis-specific MD bits 1 (axial bits 1)
Bit 3 The actual value (actual position display) is converted into division positions. A
division position < 1 is not possible (applies to both rotary and linear axes). The
actual value display in the Service data is not converted into division positions.
If bit 3 is not set for a division axis, the position is assigned (over command
channel) in division positions but the actual value is displayed in mm or inches. Also
see Section entitled ”Functional Descriptions”.
Active: At once
Bit 2 The signs of the measuring-system pulses can be inverted by changing the state of
this bit (this is necessary when the axis traverses uncontrollably due to an incorrect
position control direction). This bit has no effect, if the spindle and the C axis have
the same actual value. In this case the spindle bit is active instead.
Active On: NC STOP
Bit 1 A change in the state of the bit changes the polarity of the speed controller's
setpoint voltage (necessary when the axis moves in a direction which is
'mechanically' incorrect).
Active On:
RESET
Bit 0 Bit 0 = 1 Start reference point approach with " - " key
Bit 0 = 0 Start reference point approach with " + " key
Active On: RESET
7 6 5 4 3 2 1 0
Bit No.
NC MD
568*
AXIS NAME
Default value
MD T M
5680 0000 0000 0000 0000
5681 0000 0010 0000 0001
5682 0 0000 0010
5683
.
.
.
5709
0
.
.
.
0
0
.
.
.
0
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–147
SINUMERIK 840C (IA)