Owner's manual

Coordinate Control
Chapter 13
13-13
Figure 13.7
Incremental and Absolute Commands.
20
10
Y
X
Startpoint
Endpoint
10 35
Absolute command
G90X10.Y20.;
Incremental command
G91X-25.Y10.;
The selection of a unit system (inch or metric) can be done by
programming e ither G20 for the inch system or G21 for the metric system.
These unit system G codes should be among the first blocks written in a
program.
Both G20 and G21 are modal, and cancel each other. The default unit
system selected by the control at power-up is determined in AMP by the
system installer.
The currently active unit system is usually displayed on the screen for
softkey level 1 in lines 3 or 4 between the [] symbols. If the screen
selected for display of softkey level 1 is the status screen the active system
G c ode (G21 or G20) will be displayed among the active system G codes.
These functions are affected by the active unit system (inch or metric).
Position c ommands
Feedrate commands
Axis feed amount for fixed amount feed operation
Unit system for hand pulse generator (HPG)
13.4
Inch/Metric Modes (G20,
G21)