System Of Units, Metric/Inch; Function; Parameterized And Programmed System Of Units - Siemens SINUMERIK 840D Function Manual

2.3

System of units, metric/inch

2.3.1

Function

2.3.1.1

Parameterized and programmed system of units

SINUMERIK control systems can operate with a metric system of units as well as an inch
system of units.
Parameterized system of units (basic system)
The basic setting of the system of units (basic system) is set in machine data MD10240
$MN_SCALING_SYSTEM_IS_METRIC (see "Commissioning (Page 41)").
Depending on the basic system, all length-related data is interpreted either as metric or inch
system of units.
Metric system of units:
Inch system of units:
The basic system also defines the interpretation of the programmed F value for linear axes:
Feed type
G94
G95
Programmed system of units
Using the commands of G group 13 (system of units, inch/metric) within the part program, you
can toggle between the metric and inch system of units (see "Programming (Page 45)").
The programmed system of units and the basic system may be identical or different at any time.
Switchover of the system of units within a particular section of the part program could, for
example, be used to machine an inch thread on a workpiece within a metric basic system.
The reset setting of the G group is defined in machine data MD20150
$MC_GCODE_RESET_VALUES (see "Commissioning (Page 41)").
HMI display
Data relating to length is displayed as follows on the user interface:
Machine data
Data in the machine coordinate
system
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
G2: Velocities, setpoint / actual value systems, closed-loop control
mm, mm/min, m/s2, m/s3, mm/rev.
inch, inch/min, inch/s2, inch/s3, inch/rev.
Metric system of units
mm/min
mm/rev.
in the basic system
x
x
2.3 System of units, metric/inch
Inch system of units
inch/min
inch/rev.
Display
in the programmed system of
units
39