Siemens SINUMERIK 840Di Manual page 288

10 NC Start-Up with HMI Advanced
10.3 System data
System data
Machine data
Table 10-9 Switching over the unit system: Machine data
Number
General ($MN_ ...)
10240 SCALING_SYSTEM_IS_METRIC
10250 SCALING_VALUE_INCH
10260 CONVERT_SCALING_SYSTEM
Axis-specific ($MA_ ...)
32711 CEC_SCALING_SYSTEM_METRIC
References
10-288
When switching over the unit system, from the view of the user, all length-re-
lated specifications are converted to the new unit system automatically. These
data include:
S
Positions
S
Feedrates
S
Accelerations
S
Jerk
S
Tool offsets
S
Programmable, settable and external zero offsets, DRF offsets
S
Compensation values
S
Protection zones
S
Machine data
S
Jog and handwheel weightings.
After switching, all above mentioned data are available in the physical quantities
as specified in Subsection 10.3.2 (page 10-283).
Data for which no unambiguous physical quantities are defined, such as:
S
R parameters
S
GUDs (Global User Data)
S
LUDs (Global User Data)
S
PUDs (Program global User Data)
S
Analog input/outputs
S
Data exchange through the FC21
will not be subject to automatic conversion. It is the user's task to take into ac-
count the unit system currently active (MD 10240: SCALING_SYS-
TEM_IS_METRIC).
The unit system setting currently active can be read from the PLC interface us-
ing the signal "Inch unit system" DB10.DBX107.7. The unit system change
counter can be read in DB10.DBB71.
Identifier
Metric scaling system
Conversion factor for switchover to the inch
system
Basic system switch active
Unit system of sag compensation
/FB/ Description of Functions, Basic Machine,
G2 Velocities, Setpoint/Actual Value Systems, Closed-Loop Control,
Section: Metric/inch measuring system
Name/remarks
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03
Ref.
G2