Siemens SINUMERIK 840D sl Programming Manual page 409

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STOPFIFO stops the machining until the preprocessing memory has been filled or

STARTFIFO or STOPRE is detected.

Example of marking a processing section

The high-speed processing section to be buffered in the preprocessing memory is marked at

the beginning and end with STARTFIFO or STOPFIFO respectively.

N10 STOPFIFO

N110 STARTFIFO

Execution of these blocks does not begin until the preprocessing memory is full or command

STARTFIFO is detected.

The preprocessing memory is not filled or filling is interrupted if the processing section

contains commands that require unbuffered operation (reference point approach, measuring

functions, ...).

Example of stopping preprocessing STOPRE

If STOPRE is programmed the following block is not executed until all preprocessed and

saved blocks are executed in full. The preceding block is halted in exact stop (as with G9).

N30 MEAW=1 G1 F1000 X100 Y100 Z50

The control generates an internal preprocessor stop upon access to machine status data

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 sequences.

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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

9.6 Program run with preprocessing memory (STARTFIFO, STOPFIFO, STOPRE)

;Read actual value of X axis

Path traversing behavior