Siemens SINUMERIK 840C Installation Instructions Manual page 332

12.93
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:
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:
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:
Bit 0 Bit 0 = 1 Start reference point approach with " - " key
Bit 0 = 0 Start reference point approach with " + " key
Active On:
NC MD 7
568*
Default value
MD
5680 0000 0000
5681 0000 0010
5682
5683
.
.
.
5709
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
At once
NC STOP
RESET
RESET
Bit No.
6 5 4
AXIS NAME
T M
0000 0000
0000 0001
0 0000 0010
0 0
. .
. .
. .
0 0
6FC5197- AA50
6.6.4 Axis-specific MD bits 1 (axial bits 1)
3 2 1 0
6–147