Siemens SINUMERIK 840DE Programming Manual page 88

Positional Data
3.4 Dimensions inch/metric, (G70/G700, G71/G710)
Further information
All other parameters such as feedrates, tool offsets or settable zero offsets are interpreted
(when using G70/G71) in the default system of units (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/, Description of Functions, Basic Machine, G2 section "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 system of units is used.
References:/PGA/ Programming Guide, Advanced, Section "Movement Synchronized
Actions".
/FBSY/ , Description of Functions, Synchronized Actions
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Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals