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

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Path traversing behavior

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

Program sequence with preprocessing memory (STOPFIFO,

STARTFIFO, FIFOCTRL, STOPRE)

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

of the preprocessed and buffered blocks starts only after the

preprocessing memory is full.

Automatic preprocessing memory control

Automatic preprocessing memory control is called with the

initially works just like

preprocessing memory is full. However, the response to the emptying of the preprocessing

memory does differ: With

level reaches 2/3 in order to prevent complete emptying and deceleration to standstill.

. Whatever the programming, processing will not start until the

, the path velocity is reduced increasingly once the fill

respectively. The processing

Programming Manual, 03/2013, 6FC5398-2BP40-3BA1

command or if the

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