Siemens SINUMERIK 840D sl Function Manual page 1055

DB31, ...
DBB4
Bit 7, 6 Plus and minus traverse keys
Edge evaluation: No
Signal state 1 or The selected machine axis can be traversed in both directions in JOG mode with the traverse keys
edge change 0 → 1 plus and minus.
Depending on the active machine function as well as the setting of the setting data:
SD41050 $SN_JOG_CONT_MODE_LEVELTRIGGRD
(Jog/cont. mode continous with JOG)
continuous with JOG
and/or in machine data:
MD11300 $MN_JOG_INC_MODE_LEVELTRIGGRD
when JOG-INCR (INC and REF in jog mode),
different reactions are triggered on a signal change.
Case 1: Continuous traversal in jog mode
The machine axis traverses in the direction concerned as long as the interface signal
is set to 1 (and as long as the axis position has not reached an activated limitation).
Case 2:Continuous traversal in continuous mode
On the first edge change 0 →1 the machine axis starts to traverse in the relevant direction. This
traversing movement still continues when the edge changes from 1 → 0. Any new edge change
0 →1 (same traversing direction!) stops the traversing movement.
Case 3:Incremental traversal in jog mode
With signal 1 the machine axis starts to traverse at the set increment. If the signal changes to the 0
state before the increment is traversed, the traversing movement is interrupted. When the signal
state changes to 1 again, the movement is continued. The axis can be stopped and started several
times as described above until it has traversed the complete increment.
Case 4: Incremental traversal in continuous mode
On the first edge change 0 → 1 the machine axis starts to traverse at the set increment. If another
edge change 0 → 1 is performed with the same traverse signal before the axis has traversed the
increment, the traversing movement will be cancelled. The increment traversing will then not be
completed.
If both traverse signals (plus and minus) are set at the same time there is no movement or a
current movement is aborted.
The effect of the traverse keys can be disabled for every machine axis individually with the PLC
interface signal:
DB31, ... DBX4.4 (Traverse key disable).
Signal state 0 or See cases 1 to 4 above.
edge change 1 → 0
Signal irrelevant for Operating modes AUTOMATIC and MDA
...
Application The machine axis cannot be traversed in JOG mode if it is already being traversed via the channel-
example(s) specific PLC interface (as a geometry axis).
Alarm 20062 is signaled.
Special cases, ...... Indexing axes
Corresponding to .... DB21, ... DBX12.7, DBX12.6 ff (Traverse keys plus and minus for geometry axes)
DB31, ... DBX4.4 (traversing key disable)
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Signal(s) updated: Cyclically
Z2: NC/PLC interface signals
19.4 Manual and handwheel travel
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