Siemens SINUMERIK 840Di - Page 284

06.03
10.3 System data
10-284
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The following applies:
Selected inputoutput unit 
MD : SCALING_FACTORS_USER_DEF[n]*internal unit
Enter the selected input/output unit expressed in the internal units 1mm,
1 degree and 1 sec in MD 10230: SCALING_FACTORS_USER_DEF[n].
Table 10-7 Bit number and index for user definition
Physical quantity MD 10220:
Bit number
MD 10230:
Index n
Linear position 0 0
Angular position 1 1
Linear velocity 2 2
Angular velocity 3 3
Linear acceleration 4 4
Angular acceleration 5 5
Linear jerk 6 6
Angular jerk 7 7
Timer 8 8
KV factor 9 9
Rotational feedrate 10 10
Compensation value of linear position 11 11
Compensation value of angle position 12 12
Example 1:
The machine data input/output of linear velocities is to be carried out in m/min,
instead of mm/min (default). The internal unit is mm/sec.
Via MD 10220: SCALING_USER_DEF_MASK Bit2 = 1 is used to enter the
scaling factor for linear velocities as a user-defined value.
The scaling factor is calculated using the following formula:
MD : SCALING_FACTORS_USER_DEF[n] 
Selected inputoutput unit
internal unit
MD : SCALING_FACTORS_USER_DEF[n] 
1
m
min
1
mm
secs

1000mm
60secs
1
mm
secs

1000
60
 16, 667;
 MD : SCALING_FACTORS_USER_DEF[2]  16, 667
Index 2 specifies the “linear velocity” (see above).
Example 2:
In addition to the change of example 1, the machine data input/output of linear
accelerations, is to be performed in ft/sec
2
, instead of m/sec
2
(default).
(The internal unit is mm/sec
2
.)
10 NC Start-U
p
with HMI Advanced