Siemens SINUMERIK 840D sl, Function Manual

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Detailed description
2.8 Single block
Basic logic functions: Mode group, channel, program operation, reset response (K1)
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Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.8.1 Decoding single block SBL2 with implicit preprocessing stop
Asynchronicity
As a result of preprocessing of part program blocks, the reference between the current block
display relative to the main run status of the NCK and the variable values displayed on the
HMI can be lost. The operator display then shows implausible variable values.
Preprocessing stop for each block
A preprocessing stop is executed for active SBL2 with each block with the channel-specific
setting data SD42200 $SC_SINGLEBLOCK2_STOPRE (activate debug mode for SBL2).
This suppresses preprocessing of part program blocks and maintains the relationship
between the current block display and the variable values display.
Note
This variant of SBL2 does not maintain an accurate contour. In other words, as a result of
the preprocessing stop, a different contour may be generated from the one created without
single-block mode or with SBL1.
Application: Debug mode for testing part programs.
2.8.2 Single block stop: Suppression using SBLOF
Single block off
Programs characterized by the
SBLOF
language command are executed completely in one
block as with every type of single block.
SBLOF
is also valid in the called subroutines.
SBLOF
Example for subroutine without stop in single block:
PROC EXAMPLE SBLOF
G1 X10
RET
At the return command, the decision is made whether to stop at the end of the subprogram:
Return jump with M17 Stop at the end of the subprogram
Return jump with RET No stop at end of subroutine