6 Assi
nin
Parameters to the Control and the PLC Pro
ram
6
03.96
6.6 System data
6-100
 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
The standard units of the physical quantities of the machine data are as follows:
Physical quantity Metric Inch
Linear position 1 mm 1 inch
Angular position 1 degree 1 degree
Linear velocity 1 mm/min 1 inch/min
Angular velocity 1 rev/min 1 rev/min
Linear acceleration 1 mm/s
2
1 inch/s
2
Angular acceleration 1 rev/s
2
1 rev/s
2
Linear jerk 1 mm/s
3
1 inch/s
3
Angular jerk 1 rev/s
3
1 rev/s
3
Timing 1 s 1 s
K
V
factor (servo gain) 1/s 1/s
Rotational feedrate 1 mm/rev 1 inch/rev
Linear position (compensation value) 1 mm 1 inch
Angular position (compensation value) 1 degree 1 degree
The physical quantities for the input/output of machine and setting data (V24,
MMC) can be defined system-wide via MD 10220: (activation of scaling factors)
and MD 10230: SCALING_FACTORS_USER_DEF (scaling factors of physical
quantities).
If the appropriate activation bit is not set in MD 10220 (activation of scaling
factors), then scaling is implemented internally with the conversion factors listed
below (default setting, exception K
V
factor). If all bits are set in MD 10220 and if
the default settings are to remain valid, then the following scaling factors must
be entered in MD 10230.
Index no. Physical quantity Input/output Internal unit Scaling factor
0 Linear position 1 mm 1 mm 1
1 Angular position 1 degree 1 degree 1
2 Linear velocity 1 mm/min 1 mm/s 0.016666667
3 Angular velocity 1 rev/min 1 degree/s 6
4 Linear acceleration 1 m/s
2
1 mm/s
2
1000
5 Angular acceleration 1 rev/s
2
1 degree/s
2
360
6 Linear jerk 1 m/s
3
1 mm/s
3
1000
7 Angular jerk 1 rev/s
3
1 degree/s
3
360
8 Timer 1 s 1 s 1
9 K
V
factor 1 m/min∗mm 1/s 16.66666667
10 Rotational feedrate 1 mm/rev 1 mm/degree 1/360
11 Linear position (compensation value) 1 mm 1 mm 1
12 Angular position (compensation value) 1 degree 1 degree 1
Internal physical
quantities
Physical
quantities for input
and output
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