Siemens SINUMERIK 840D sl Function Manual page 596

Detailed description
2.5 Block search
Subsequent actions
After completion of a block search, the following subsequent actions may occur:
• Type 1 - Type 5: Automatic Start of an ASUB
• Type 1 - Type 4: Cascaded block search
2.5.1 Sequence for block search of Type 1, 2 and 4
Time sequence
The block search (Types 1, 2, and 4) proceeds as follows:
1. Activate search via input in HMI Advanced or HMI Embedded
2. Search target found, or alarm if target cannot be found
3. NC Start for output of action blocks
4. NC Start for program continuation.
Block search
starting
Block search
active (DB21, ...
DBX33.4)
Action block
active (DB21, ...
DBX32.3)
Last action block
active (DB21, ...
DBX32.6)
Channel status
Reset (DB21, ...
DBX35.7)
Channel status
interrupted
(DB21, ... DBX35.6)
Figure 2-2 Time sequence of interface signals
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When the last action block is activated, a user program can be started as an ASUB.
A further block search with a different target specification can be started from "Search
target found".
Search target 1
found
Block search Search target 2
starting found
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Last
NC Start
action block
action blocks
being output
Function Manual, 11/2006, 6FC5397-0BP10-2BA0