Siemens Sinumerik 840D sl Programming Manual page 292

Coordinate transformation (FRAMES)
5.1 Coordinate transformation via frame variables
$P_IFRAME
Current, settable frame variable that establishes the reference between the basic origin
system (BOS) and the settable zero system (SZS).
• $P_IFRAME corresponds to $P_UIFR[$P_IFRNUM]
• After G54 is programmed, for example, $P_IFRAME contains the translation, rotation,
scaling and mirroring defined by G54.
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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