Detailed Description; Functional Description - Siemens sinumerik 840D sl Function Manual

Detailed description

2.1

Functional description

Meaning
To be able to resume interrupted machining at a specific point in a part program, a block
search can be carried out using the "Block search with calculation on contour" standard
function. However, detailed knowledge of the part program is required to be able to enter the
block number of the part program block required for the block search (i.e. the number of the
block the search needs to locate).
The "Continue machining - Retrace support" technological function (referred to as RESU
below) supports the continuation of the machining operation by means of an implicit block
search with calculation on the contour without the machine operator needing to know the
part program block required.
Continue machining might be required for example in a laser cutting application if the laser is
lost during the machining operation and machining needs to resume at the point at which it
was interrupted.
RESU provides the following automatic subfunctions to support program continuation:
• Function-specific reverse travel along the contour to the required program continuation
• Automatic identification of the part program block associated with the program
• Block search with calculation on the contour for the part program block identified
• Repositioning on the contour at the program continuation point
• Continuation of part program machining
To approach the required program continuation point exactly, it is possible to switch several
times between reverse and forward travel along the contour during the continue machining
process.
RESU is activated by programming the function-specific part program command
CC_PREPRE(1). In the context of RESU, only the contour range between the RESU start
CC_PREPRE(1) and the interruption point (NC STOP) can be retraced.
Once RESU has been launched, all part program blocks in which traversing movements are
programmed are logged by RESU for possible subsequent reverse travel. Contour ranges
for which continuing machining is irrelevant can be excluded from the log using RESU stop
CC_PREPRE(0).
Contour ranges not logged are bridged by straight lines between the starting and end points
during reverse/forward travel.
Special functions: Retrace Support (TE7)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
point
continuation point
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