Siemens SINUMERIK 828D Function Manual page 346

G2: Velocities, setpoint / actual value systems, closed-loop control
7.3 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)
• PUDs (Program global User Data)
• Analog inputs/outputs
• Data exchange via FC21
In this case, the user is requested to take into account the currently valid system of units:
MD10240 $MN_SCALING_SYSTEM_IS_METRIC
The current system of units setting can be read using the signal:
DB10 DBX107.7 (inch measuring system)
Using the signal:
DB10 DBB71 (change counter, system of units inch/metric)
the "system of units change counter" can be read out
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions