Siemens SINUMERIK 840Di - Page 288

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-U
p
with HMI Advanced