Dimensional Units In Machining Programs; 6,10 Absolute And Relative Dimensions 2 - 4 - Siemens SIMATIC S5 Manual
Positioning module
1p 247
for stepper motors
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Also See for SIMATIC S5:
- Manual (396 pages) ,
- Equipment manual (197 pages) ,
- Operating instructions manual (43 pages)
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Machining Programs and their Structure
2.6.6.8
Dimensional Units in Machining Programs
The IP247 positioning module interprets machining programs in the dimensional unit specified in
the machine data, i.e.:
machine data in 0,1 inches
machine data in mm
machine data in degrees = >G70 and G71 disabled
Following the function G70, all further distances are interpreted in 0.1 inches and all further
speeds as 0.1 inches/rein.
Following the function G71, all further distances are interpreted in dimensional unit mm and all
further speeds as dimensional unit mm/min.
Reference Point
2.6.6.9
A statement containing G74 moves the carriage or tool holder to the known reference or home
point at the incremental speed. No reference point approach for calibration purposes is ex-
ecuted, The carriage always moves to the physically stipulated reference point, regardless of
whether the coordinate has been changed by a zero offset. Following the movement, the display
of the actual position value takes into account both a zero offset and a tool length offset.
Example
reference point coordinate
effective zero point offset
effective tool offset
After G74 is executed, the axis is positioned at the physically specified reference point. The tip of
the tool juts out 20 mm from this point. -480 mm is indicated as the actual position.
2.6.6.10 Absolute and Relative Dimensions
All target information (X-functions) following G90 is interpreted as absolute until G91 is entered.
All target information (X-functions) after G91 is interpreted as relative until G90 is entered.
2-46
= >G70 default
= >G71 default
. 0 mm
. +500 mm and
= 20 mm
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