Siemens SINUMERIK 840D sl Function Manual page 1042

Z2: NC/PLC interface signals
19.4 Manual and handwheel travel
DB21, ...
DBB12, 16, 20
Bit 7, 6 Plus and minus traverse keys for geometry axis (1, 2, 3)
Edge evaluation: No
Signal state 1 or The selected geometry 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 "Jog or continuous mode":
SD41050 $SN_JOG_CONT_MODE_LEVELTRIGGRD (Jog/cont. mode continous with JOG)
and
MD11300 $MN_JOG_INC_MODE_LEVELTRIGGRD (INC and REF in jog mode)
different reactions are triggered on a signal change.
Case 1: Continuous traversal in jog mode
The geometry 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 geometry 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 geometry 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 geometry 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 geometry axis starts to traverse at the set increment. If another
edge change 0 → 1 is performed with the same traverse signal before the geometry 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, no movement occurs, or any
current movement is aborted!
The effect of the traverse keys can be disabled for every geometry axis individually with the PLC
interface signal "Traverse key disable".
Notice!
In contrast to machine axes, for geometry axes, only one geometry axis can be traversed at any
one time using the traversing keys. Alarm 20062 is triggered if an attempt is made to traverse more
than one axis with the traverse keys.
Signal state 0 or See cases 1 to 4 above.
edge change 1 → 0
Signal irrelevant for Operating modes AUTOMATIC and MDA
...
Special cases, The geometry axis cannot be traversed in JOG mode:
errors, ....
•
•
Alarm 20062 "Axis already active" is output.
Corresponding to .... DB31, ... DBX8.7 or DBX8.6 (Traverse keys plus and minus for machine axes)
DB21, ... DBX12.4 ff (Traverse key disable for geometry axes)
1042
Signal(s) updated: Cyclically
if it is already being traversed via the axial PLC interface (as a machine axis).
If another geometry axis is already being traversed with the traverse keys.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions