Siemens SINUMERIK 840D sl Function Manual page 414

Detailed description
2.2 Metric /inch measuring system
System data
When changing over the measuring system, from the view of the user, all length-related
specifications are converted to the new measuring system automatically.
This includes:
• Positions
• Feedrates
• Acceleration rates
• Jerk
• Tool offsets
• Programmable, settable and work offsets external and DRF offsets
• Compensation values
• Protection zones
• Machine data
• Jog and handwheel factors
After the changeover, all of the above data is available in physical quantities.
Data, for which no unique physical units are defined, is not converted automatically.
This includes:
• R parameters
• GUDs (Global User Data)
• LUDs (Local User Data)
• PUD (Program global User Data)
• Analog inputs/outputs
• Data exchange via FC21
The user is prompted to take the current valid measuring system:
MD10240 $MN_SCALING_SYSTEM_IS_METRIC
into account.
The current measuring system setting can be read at the PLC interface via the "inch
measuring system" signal:
DB10 DBX107.7.
Signal:
DB10 DBB71 (inch/metric measuring system modification counter)
can be used for reading the "measuring system modification counter".
26
Basic logic functions: Velocities, Setpoint/Actual Value Systems, Closed-Loop Control (G2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0