Siemens SINUMERIK 840D Function Manual page 240

T1: Indexing axes
8.2 Detailed description
Continuous traversing (JOG CONT)
Jog mode
In the jog mode (SD41050 $SN_JOG_CONT_MODE_LEVELTRIGGRD = 1) the indexing axis
traverses in the selected direction after the traversing key has been actuated. The indexing axis
is stopped at the next possible indexing position after releasing the traversing key. The indexing
position where the axis stops is dependent on:
● Distance to the indexing position
● Traversing velocity
● Axis dynamic response
Continuous operation
In continuous operation (SD41050 $SN_JOG_CONT_MODE_LEVELTRIGGRD = 0), after
actuating the traversing key (first rising edge), the indexing axis is traversed as usual. The
indexing axis is stopped at the next possible indexing position when the traversing key is
actuated again (second rising edge). The indexing position where the axis stops is dependent
on:
● Distance to the indexing position
● Traversing velocity
● Axis dynamic response
Generally, indexing axes are traversed in the jog mode.
Direction change
If, before reaching the indexing position, the operator changes the direction by actuating the
traversing key for the opposite direction, the indexing axis continues to traverse to the next
possible indexing position where it can then be stopped. The traversing motion must then be
started in the opposite direction by again actuating the traversing key.
Further information
You can find detailed information on the traversing axes in the JOG mode in:
H1: Manual traversing (Page 633)
Incremental traversing (INC)
Independent of the active technology function (INC1, INC10, ... , INCvar), the indexing axis
always moves in the selected direction to the next indexing position after the traversing key has
been pressed.
Jog mode
In the jog mode (SD41050 $SN_JOG_CONT_MODE_LEVELTRIGGRD = 1), the indexing axis
is immediately stopped after releasing the traversing key. Under certain circumstances, the
indexing axis is then not located at an indexing position. Traversing motion is continued at the
indexing position by again actuating the traversing key.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA