Siemens SINUMERIK 840D sl Programming Manual page 299

Significance
G140:
G141:
G142:
G143:
G147:
G148:
G247:
G248:
G347:
G348:
G340:
G341:
DISR:
DISCL:
FAD:
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Approach and retraction direction dependent on the current compensation
side (basic setting)
Approach from the left or retraction to the left
Approach from the right or retraction to the right
Approach and retraction direction dependent on the relative position of the
start or end point to the tangent direction
Approach with a straight line
Retraction with a straight line
Approach with a quadrant
Retraction with a quadrant
Approach with a semicircle
Retraction with a semicircle
Approach and retraction in space (basic setting)
Approach and retraction in the plane
Approach and retraction with straight lines (G147/G148)
Distance of the milling tool edge to the starting point of the contour
Approach and retraction along circles (G247, G347/G248, G348)
Radius of the tool center path
Notice: For REPOS with a semicircle, DISR is the circle diameter
DISCL=... distance of the end point of the
fast feed movement to the machining plane
DISCL=AC(...) specification of the absolute position of the end point of the
fast feed movement
Speed of the slow feed movement
FAD=... the programmed value is applied corresponding to
the G code of group 15 (feedrate; G93, G94, etc.)
FAD=PM(...) the programmed value is interpreted irrespective of the active G
code, group 15 as linear feedrate (as G94)
FAD=PR(...) the programmed value is interpreted irrespective of the active G
code, group 15 as revolutional feedrate (as G95).
Tool radius compensation
10.4 Smooth approach and retraction
299