Siemens SINUMERIK 840Di Function Manual page 1958

Detailed Description
2.9 Mode group, channel, program operation, reset response (K1)
DB21, ...
DBX7.1 NC START
Edge evaluation: yes
Signal state 1 or AUTOMATIC mode: The selected NC program is started or continued, or the auxiliary functions that
edge change were saved during the program interruption are output.
0 → 1
If data are transferred from the PLC to the NC during program status "Program interrupted," then
these data are immediately cleared at NC start.
Operating mode MDA:
The entered block information or part program blocks are released for execution.
Signal state 0 or No effect.
edge change
1 → 0
Corresponds to .... DB21, ... DBX7.0 (NC start disable)
DB21, ...
DBX7.2 NC STOP at block limit
Edge evaluation: no
Signal state 1 or The current NC program is stopped after the current part program block has been completely
edge change processed. Otherwise, as for DB21, ... DBX7.3 (NC stop).
0 → 1
Signal state 0 or No effect.
edge change
1 → 0
Corresponds to .... DB21, ... DBX7.3 (NC stop)
DB21, ... DBX7.4 (NC stop, axes plus spindles)
DB21, ... DBX35.2 (program status stopped)
DB21, ... DBX35.6 (channel status interrupted)
2-94
Signal(s) updated: cyclic
Signal(s) updated: cyclic
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0