Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 361

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Chapter 11
Coordinate Control
11-45
Example 11.14
Absolute vs. Incremental Commands
Absolute Comman d Incremental Command
G90X20.Z10.; G91X10.Z -25.;
Figure 11.26
Results of Example 11.14
20
10
X
Z
Start point
Endpoint
10 35
12181-I
You can program a G70 to select the inch system or a G71 to select the
metric system. These unit system G codes should be among the first
blocks written in a program.
Both G70 and G71 are modal, and cancel each other. The default unit
system selected by the control at power-up, end of program (M02, M30, or
M99) and control reset is determined in AMP by your system installer.
The currently active unit system i s 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 code (G71 or G70) is displayed among the active system G codes.
Following is a list of some of the functions that are affected by the active
unit system (inch or metric):
Position commands
Feedrate commands
Axis feed amount for fixed amount feed operation
Unit system for hand pulse generator (HPG)
11.10
Inch/Metric Modes (G70,
G71)
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