Siemens SINUMERIK 840C - Manual (Page 329)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 08.96
6.6.4 Axis-specific MD bits 1 (axial bits 1)
6.6.4 Axis-specific MD bits 1 (axial bits 1)
7 6 5 4 3 2 1 0
Bit No.
NC MD
560*
Act.-value
display
modulo 360
deg. Automatic
direction
recog. on
referencing Software
limit
switches
active NC start
although
ref. pt. not
reached
Rounding
for rotary
axes Rounding to
whole/half
degrees
Dyn. SW
limit switch
for
following
axes
Servo loop
monitor not
active
Default value: MD 5600-5629 0010 0000
Bit 7 For rotary axes (NC MD 564*, bits 5-1)! Acts on linear axes as well.
The actual-value display jumps from 359.999 to 0 degrees after one
revolution of the rotary axis.
Rotary axes, see also Section Functional Descriptions.
Active On: RESET
Bit 6 Bit 6 =1 The NC can detect precisely the direction in which the reference point
lies from the "Deceleration" interface signal, as the reference point
extends up to the traversing limit (also see Section Axis (Analog) and
Spindle Installation).
Active On: NC STOP
Traversing limit
Reference point cam
Operating point
Ref. point
Bit 6 = 0 If the axis is between the reference point cam and EMERGENCY STOP
when the control is powered up, the axis moves to EMERGENCY STOP
during reference point approach, as the control cannot detect from the
"Deceleration" interface signal whether the axis is ahead of or behind
the reference point cam (also see Section Axis (Analog) and Spindle
Installation).
Bit 5 Bit 5 = 0 The software limit switches defined in NC MD 224* to 236* are overrun
without a reaction of any kind. The working field limitation (setting data)
is not in force.
Active On:
RESET
6–144 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)