Siemens SINUMERIK 840Di Function Manual page 556

Detailed Description
2.4 Program test
2.4.2 Program execution in singleblock mode
Functionality
The part program can be started via interface signal:
DB21, ... DBX7.1 (NC Start).
When the "Single block" function is activated, the part program stops executing after every
program block. If tool cutter radius compensation or a tool nose radius correction is selected,
processing stops after every intermediate block inserted by the control.
The program status switches to "Program status stopped".
The channel status remains active.
The next part program block is processed on NC Start.
Usage
The user can execute a part program block-by-block to check the individual machining steps.
Once the user decides that an executed part program block is functioning correctly, he can
call the next block. This is done by triggering NC Start.
Single-block type
The following different types of single block are provided:
• Decoding single block
• Action single block
Action single block is the initial setting.
For information on selection of single block mode, refer to:
References:
/BA/ Operator's Guide
Caution
In a series of G33/G34/G35 blocks, a single block is only operative if "Dry run feed" is
selected.
Calculation blocks are not processed in single step mode (only if single decoding block is
active).
SBL2 is also ineffective with G33/G34/G35.
2-20
With this type of single block, all blocks of the part program (even the pure computation
blocks without traversing motions) are processed sequentially by "NC Start".
With this type of single block, all blocks that initiate actions (traversing motions, auxiliary
function outputs, etc.) are processed individually. Blocks that were generated additionally
during decoding (e.g., for cutter radius compensation at acute angles) are also processed
individually in singleblock mode. Processing is however not stopped at calculation blocks
as these do not trigger actions.
Mode Group, Channel, Program Operation, Reset Response (K1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0