Siemens SINUMERIK 840D sl Function Manual page 1101

19.11 Positioning axes
The following signals or commands on the NCK-HMI-PLC interface are only of significance
for the positioning axis:
Figure 19-2
19.11.1 Signals to axis/spindle (DB31, ...)
DB31, ...
DBB0
Edge evaluation: No
Signal state 1 or edge
change 0 → 1
Signal irrelevant for ...
References
DB31, ...
DBX2.2
Edge evaluation: Yes
Signal state 1 or edge
change 0 → 1
Special cases,
errors, ....
Corresponding to ....
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Signal modification by the PLC
Feedrate override/spindle override axis-specific
Signal(s) updated: Cyclic
Positioning axes have their own axis-specific feed override value. This feedrate override is
evaluated in the same way as the channel-specific feedrate override.
NST DB31, ... DBX74.5 ("Positioning axis") = ZERO
Evaluation see:
DB21, ... DBB4 (feed rate override); channel-specific
Delete distance-to-go, axis-specific
Signal(s) updated: Cyclic
The axis-specific distance-to-go of the positioning axis is canceled. The positioning axis is
decelerated and the following error is eliminated. The programmed end position is deemed to
have been reached. The path axes are not influenced by the axis-specific "delete distance-to-
go" interface signal. The channel-specific "delete distance-to-go" interface signal is used for
this purpose.
If the axis-specific "delete distance-to-go" interface signal is enabled, even if no positioning
axes have been programmed in this block, the NCK does not respond.
DB21, ... DBX6.2 (delete distance-to-go); channel-specific for path axes
NC/PLC Interface Signals (Z2)
Positioning axes
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