Siemens SINUMERIK 840Di sl Programming Manual page 90

Positional Data
3.4 Dimensions inch/metric, (G70/G700, G71/G710)
Note
All other parameters such as feedrates, tool offsets or settable zero offsets are
interpreted (when using G70/G71) in the default measuring system
(MD 10240: SCALING_SYSTEM_IS_METRIC).
The representation of system variables and machine data is also independent of the
G70/G71 context.
If the feedrate in the G70/G71/G700/G710 context is to be activated, a new F value must be
programmed explicitly.
All length-related NC data, machine data and setting data for G700/G710 are always read
and written in the programmed context of G700/G710.
References:
/FB1/Function Manual Basic Functions; Speeds, Setpoint/Actual-Value System, Closed-Loop
Control (G2), "Metric/Inch Measuring System"
Synchronized actions
If positioning tasks are performed in synchronized actions and no G70/G71/G700/G710
command is programmed in the synchronized action itself, the G70/G71/G700/G710 context
active at the time of execution determines which measuring system is used.
References:
/PGA/Programming Manual Advanced; "Motion-Synchronous Actions"
/FBSY/Description of Functions, Synchronized Actions.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals