Siemens sinumerik 840d Programming Manual page 193

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Frame variable/frame relationship

A coordinate transformation can be activated by

assigning the value of a frame to a frame variable.

Example: $P_PFRAME=CTRANS(X,10)

Frame variable:

$P_PFRAME means: current programmable frame.

CTRANS(X,10) means: programmable zero offset

of X axis by 10 mm.

Reading out actual values

The current actual values of the coordinate system

can be read out via predefined variables in the part

$AA_IM[axis]

$AA_IB[axis]

$AA_IBN[axis] Read actual value in BOS

$AA_IEN[axis] Read actual value in SZS

$AA_IW[axis]

Overview of predefined Frame variables

Current base frame variable that establishes the

reference between the basic coordinate system

(BCS) and the basic origin system (BOS).

For the base frame described via $P_UBFR to be

immediately active in the program, either

• you have to program a G500, G54...G599, or

• you have to describe $P_BFRAME with

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition

6.1 Coordinate transformation via frame variables

Read actual value in MCS

Read actual value in BCS

Read actual value in WCS

$P_IFRAME, $P_UIFR[..]

$P_BFRAME, $P_UBFR

$P_BFRAME, $P_UBFR

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