Siemens SINUMERIK 840D sl Function Manual page 407

2.2 Metric/inch measuring system
2.2.1 General
The control system can operate with the inch or the metric system of measurement.
Initial state
The initial state is defined via the following machine data element:
MD10240 $MN_SCALING_SYSTEM_IS_METRIC (basic metric system).
Depending on the setting in the MD, all geometric values are interpreted either as metric or
inch values.
All manual settings also refer to this initial state (e.g., handwheel, INC, JOG feedrate), as do
zero offsets, tool offsets, FRAMES, etc., and the associated displays.
Supplements
The setting:
MD10260 $MN_CONVERT_SCALING_SYSTEM=1
greatly simplifies a change in the measuring system.
• HMI user interface: Softkey in the "Machine" operating area for changing the measuring
• Automatic conversion of active NC data when the measuring system is changed.
• Data backup is performed with the actual measuring system identifier.
• The measuring system for sag compensation is configured in machine data element:
• The measuring system for positional data of the indexing axis tables and switching points
Basic logic functions: Velocities, Setpoint/Actual Value Systems, Closed-Loop Control (G2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
system.
MD32711 $MA_CEC_SCALING_SYSTEM_METRIC
References:
/FB2/ Function manual, Extended Functions; Compensations (K3)
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)
Detailed description
2.2 Metric /inch measuring system
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