Siemens SINUMERIK 840C - Manual (Page 272)

08.96 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
Auxiliary
function
output
before
travel
No de-
celeration
at limit
switch
Working
area
limitation
in force in
JOG mode
Interpol.
params
dependent
on
G91/G90
Internal
WAIT mark
synchroni-
zation (as
from SW
5.6)
No NC
STOP in
dwell block
G04S.../G1
4/G24 (as
from SW
5.4)
7 6 5 4 3 2 1 0
Bit No.
NC MD
5003
Polar
coord.
angle de-
pendent
on
G91/G90
Do not clear
PRESET
OFFSET on
POWER
ON
Default value: 0000 0100
Bit 7 No deceleration on reaching the software limit switch. When this bit is set, braking
does not follow the acceleration/deceleration curve; only the following error is
suppressed. The limit switch is not overrun to any great extent (also see NC MD
1100*).
Active: NC Stop
Note
In the case of interpolating axes, all axes are stopped when the range limit of an
axis is reached. Stopping without a contour violation, however, is guaranteed only
when bit 7 of MD 5003 is not set (no deceleration at limit switch), i.e. deceleration
takes place over the acceleration ramp.
Speed specified by interpolator
Actual axis speed
Bit 7=0
V
t
Bit 7=1
V
t
Bit 6 The working area limitation is also effective in JOG mode. In addition to the
software limit switches, the working area can therefore be limited in JOG mode,
thereby better safeguarding the machine against unintentional travel. However,
since a working area limitation is a software limitation, proper operation can only be
ensured following reference point approach.
Active: NC Stop
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–87
SINUMERIK 840C (IA)