06.03
10.3 System data
10-283
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
10.3.2
Normalization of phys. quantities of Machine and Setting data
Machine and setting data having a physical unit are interpreted in the input/out-
put units listed in Table 10-6 by default, depending on the scaling system (met-
ric/inch).
The internally used units which the NC uses are independent and fixed.
Table 10-6
Normalization of phys. units of machine data and setting data
Physical quantity
Input/output units for the
default scaling system
Internally used
Unit
Metric
Inch
Linear position
1 mm
1 inch
1 mm
Angular position
1 degree
1 degree
1 degree
Linear velocity
1 mm/min
1 inch/min
1 mm/sec
Angular velocity
1 rpm
1 rpm
1 degree/sec
Linear acceleration
1 m/sec
2
1 inch/sec
2
1 mm/sec
2
Angular acceleration
1 rev./sec
2
1 rev./sec
2
1 degree/sec
2
Linear jerk
1 m/sec
3
1 inch/sec
3
1 mm/sec
3
Angular jerk
1 rev./sec
3
1 rev./sec
3
1 degree/sec
3
Time
1 sec
1 sec
1 sec
Position controller loop gain
1 sec
–1
1 sec
–1
1 sec
–1
Rotational feedrate
1 mm/rev.
1 inch/rev.
1 mm/degree
Compensation value of linear position
1 mm
1 inch
1 mm
Compensation value of angle position
1 degree
1 degree
1 degree
The user can define different input/output units for machine and setting data.
To this aim, an adaptation between newly selected input/output units and the
internal units must be made in
S
MD 10220: SCALING_USER_DEF_MASK (activation of scaling factors) and
S
MD 10230: SCALING_FACTORS_USER_DEF[n] (scaling factors of physi-
cal quantities)
.
Input values for machine data
Internal physical quantity
MD 10230 Scaling factor
MD 10220
Scaling factor
activated?
Internal scaling
no
Yes
Default
User-defined
10 NC Start-Up with HMI Advanced
