Program Sequence With Preprocessing Memory (Stopfifo, Startfifo, Fifoctrl, Stopre) - Siemens SINUMERIK 840D sl Programming Manual

Path traversing behavior

8.3 Program sequence with preprocessing memory (STOPFIFO, STARTFIFO, FIFOCTRL, STOPRE)

8.3 Program sequence with preprocessing memory (STOPFIFO,
8.3 STARTFIFO, FIFOCTRL, STOPRE)
Function
Depending on its expansion level, the control system has a certain quantity of so-called
preprocessing memory in which prepared blocks are stored prior to program execution and
then output as high-speed block sequences while machining is in progress. These
sequences allow short paths to be traversed at a high velocity. Provided that there is
sufficient residual control time available, the preprocessing memory is always filled.
Designate machining step
The beginning and end of the machining step to be buffered in the preprocessing memory
are identified in the part program with STOPFIFO and STARTFIFO respectively. The
processing of the preprocessed and buffered blocks starts only after the STARTFIFO
command or if the preprocessing memory is full.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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