Siemens SINUMERIK 828D Function Manual page 347

• The system of units for sag compensation is configured using:
MD32711 $MA_CEC_SCALING_SYSTEM_METRIC
References:
/FB2/ Function Manual Extended Functions; Compensations (K3)
• The measuring system for positional data of the indexing axis tables and switching points for software cams is
configured in machine data element:
MD10270 $MN_POS_TAB_SCALING_SYSTEM.
References:
/FB2/ Function Manual, Extended Functions; Software Cams, Limit Switching Signals (N3)/Indexing Axes (T1)
User tool data
For user-defined tool data:
MD18094 $MN_MM_NUM_CC_TDA_PARAM
and tool cutting edge data:
MD18096 $MN_MM_NUM_CC_TOA_PARAM
additional machine data sets are introduced:
MD10290 $MN_CC_TDA_PARAM_UNIT [MM_NUM_CC_TDA_PARAM]
MD10292 $MN_CC_TOA_PARAM_UNIT [MM_NUM_CC_TOA_PARAM]
A physical unit can be configured using these machine data. All length­related user­defined tool data are
automatically converted to the new measuring system according to the input on switchover.
Reference point
The reference point is retained. It is not necessary to repeat referencing.
Input resolution and computational resolution
The input/computational resolution is set in the control using machine data:
MD10200 $MN_INT_INCR_PER_MM
Default settings:
Metric system
1000 (0.001 mm)
Example:
1 inch = 25.4 mm ⇒ 0.0001 inch = 0.00254 mm = 2.54 μm
To be able to program and display the last 40 mm, MD10200 must be assigned a value of 100000.
Only with this identical setting for both measuring systems is it possible to change the measuring system without
a significant loss of accuracy. Once MD10200 has been set to this value, it will not need to be changed each time
the measuring system is switched over.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
G2: Velocities, setpoint / actual value systems, closed-loop control
Inch system
0.0001
7.3 Metric/inch measuring system
347