06.03
10.3 System data
10-288
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
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.
Table 10-9
Switching over the unit system: Machine data
Number
Identifier
Name/remarks
Ref.
General ($MN_ ...)
10240
SCALING_SYSTEM_IS_METRIC
Metric scaling system
10250
SCALING_VALUE_INCH
Conversion factor for switchover to the inch
system
10260
CONVERT_SCALING_SYSTEM
Basic system switch active
Axis-specific ($MA_ ...)
32711
CEC_SCALING_SYSTEM_METRIC
Unit system of sag compensation
G2
/FB/
Description of Functions, Basic Machine,
G2 Velocities, Setpoint/Actual Value Systems, Closed-Loop Control,
Section: Metric/inch measuring system
System data
Machine data
References
10 NC Start-Up with HMI Advanced
