Siemens SINUMERIK 840D sl Function Manual page 1610

Z1: NC/PLC interface signals
19.6 Mode group, channel, program operation, reset response (K1)
DB21, ...
DBX1.6 PLC action completed
Edge evaluation: no
At the end of the block search, concluding action blocks are executed:
DB21, ... DBX32.3 (action block active) == 1 AND
DB21, ... DBX32.6 (last action block active) == 1
Alarm "10208 Channel <
must be reactivated to resume the part program starting from the target block.
If other actions are to be executed by the PLC user program prior to the NC Start (e.g. tool change),
Search mode can be parameterized as follows:
MD11450 $MN_SEARCH_RUN_MODE = 1
Output of alarm delayed until the existing signal is reset.
Signal state 1 PLC action is completed.
Signal state 0 PLC action is not yet completed.
Corresponding to ... DB21, ... DBX32.3 (action block active)
DB21, ... DBX32.6 (last action block active)
DB21, ... DBX33.4 (block search active)
DB21, ...
DBX1.7 Activate program test
Edge evaluation: no
Signal state 1 Activation of the program test is requested.
During the program test, all motion commands of axes (not spindles) take place under "Axis disable."
Notice!
Due to the axis disable, the assignment of a tool magazine is not changed for the program test. The
user / machine manufacturer must utilize a suitable PLC user program to ensure that the NC-internal
tool management and the actual assignment of the tool magazine remain consistent. Refer to the
program example included in the PLC Toolbox.
Signal state 0 Activation of the program test is not requested.
Corresponding to ... DB21, ... DBX25.7 (program test selected)
DB21, ...DBX33.7 (program test active)
DB21, ...
DBB2 Activate skip block
Edge evaluation: No
Signal state 1 Skip blocks marked in the part program with a slash (/) are not processed. If there is a series of skip
blocks, the signal is only active if it is present before the first skip block of the series is decoded.
Note
The signal should be available prior to the start of the part program.
Signal state 0 Skip blocks marked in the part program with an slash (/) are processed.
Corresponding to ... DB21, ... DBX26.0 (skip block selected)
DB21, ... DBX35.2 (program status stopped)
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Signal(s) updated: Cyclically
Channel Number > Issue NC Start to continue program" notifies that NC Start
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions