Siemens SINUMERIK 828D Programming Manual page 280

Coordinate transformation (FRAMES)
5.1 Coordinate transformation via frame variables
Value assignments and reading the actual values
Frame variable/frame relationship
A coordinate transformation can be activated by assigning the value of a frame to a frame
variable.
Example:
Frame variable:
$P_PFRAME
Frame:
CTRANS(X,10)
Reading the actual values
The current actual values of the coordinate system can be read out via predefined variables
in the parts program:
$AA_IM[axis]: Read actual value in MCS
$AA_IB[axis]: Read actual value in BCS
$AA_IBN[axis]: Read actual value in BOS
$AA_IEN[axis]: Read actual value in SZS
$AA_IW[axis]: Read actual value in WCS
280
$P_PFRAME=CTRANS(X,10)
means: current programmable frame.
means: programmable zero offset of X axis by 10 mm.
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
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