Path traversing behavior
8.3 Program sequence with preprocessing memory (STOPFIFO, STARTFIFO, FIFOCTRL, STOPRE)
Job planning
464 Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
8.3 Program sequence with preprocessing memory (STOPFIFO,
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.
3URGXFWLRQSURFHGXUHIDVWEORFNVHTXHQFH
3UHSUR
FHVVLQJ
PHPRU\
1&SURJUDP
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.
Automatic preprocessing memory control
Automatic preprocessing memory control is called with the
FIFOCTRL command. FIFOCTRL
initially works just like
STOPFIFO. Whatever the programming, processing will not start until the
preprocessing memory is full. However, the response to the emptying of the preprocessing
memory does differ: With
FIFOCTRL, the path velocity is reduced increasingly once the fill
level reaches 2/3 in order to prevent complete emptying and deceleration to standstill.
Preprocessing stop
Programming the
STOPRE command in a block will stop block preprocessing and buffering.
The following block is not executed until all preprocessed and saved blocks have been
executed in full. The preceding block is halted in exact stop (as with G9).
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