Siemens SINUMERIK 840D sl Function Manual page 1611

DB21, ...
DBX6.1 Read-in disable
Edge evaluation: No
Signal state 1 The main run does not read in any preprocessed part program blocks.
Note
The signal is only active in AUTOMATIC and MDI modes.
Signal state 0 The main run reads in preprocessed part program blocks.
Corresponding to ... DB21, ... DBX35.0 (program status running)
DB21, ...
DBX6.4 Program level abort
Edge evaluation: Yes
Edge change At each edge change 0 → 1 the current program level being processed (subprogram level, ASUB
0 → 1 level, save routine) is immediately aborted. Processing of the part program continues at the next
higher program level from the exit point.
Edge change No effect.
1 → 0
Special cases, The main program level cannot be aborted with this IS, only with IS "Reset".
errors, ......
DB21, ...
DBX7.0 NC Start disable
Edge evaluation: no
Signal state 1 The NC Start disable prevents a part program from being started with NC START signal DB21, ...
DBX7.1 (NC Start) == 1.
Signal state 0 NC Start disable is not active.
Special cases, The start of a part program selected in the channel by part program command START in another
errors, ...... channel (program coordination) is not prevented by the interface signal:
DB21, ... DBX7.0 (NC Start disable) == 1.
Corresponding to ... DB21, ... DBX7.1 (NC Start)
DB21, ...
DBX7.1 NC Start
Edge evaluation: Yes
Edge change AUTOMATIC mode: The selected NC program is started or continued, or the auxiliary functions that
0 → 1 were saved during the program interruption are output.
If data is transferred from the PLC to the NC during program status "Program interrupted," then this
data is immediately cleared at NC Start.
MDI:mode
The entered block information or part program blocks are released for execution.
Edge change No effect.
1 → 0
Corresponding to ... DB21, ... DBX7.0 (NC Start disable)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
19.6 Mode group, channel, program operation, reset response (K1)
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Z1: NC/PLC interface signals
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