Siemens sinumerik 840d Programming Manual page 331

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9.6 Program run with preprocessing memory, STARTFIFO,

Restrictions

The preprocessing memory is not filled or the filling

process interrupted if the processing section

contains commands that require unbuffered

operation (reference point approach, measuring

functions, ...).

Stop preprocessing

When STOPRE is programmed, the following block is

not processed until all previously prepared and stored

blocks have been fully executed. The previous block is

halted with exact stop (as for G9).

N30 MEAW=1 G1 F1000 X100 Y100 Z50

The control system initiates an internal

preprocessing stop while status data of the machine

($A...) are accessed.

R10 = $AA_IM[X]

When a tool offset or spline interpolations are active,

you should not program the STOPRE command as

this will lead to interruption in contiguous block

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

;Read actual value of X axis

Path Traversing Behavior

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