Siemens SINUMERIK 802D sl Function Manual page 371

Incremental traversal in JOG mode (INC)
Irrespective of the current increment setting (INC1, ... ,INCvar), the indexing axis always
traverses through one indexing position in the selected direction when a traversing key "+" or
"-" is pressed .
In jog mode, the traversing movement is interrupted when the traversing key is released. The
indexing position can be approached by pressing the traversing key again.
Between indexing positions
If an indexing axis is situated between two indexing positions, then it approaches the next-
higher indexing position when the "+" traversing key is pressed in JOG-INC mode. Similarly,
pressing the "-" traversing key causes the next-lower indexing position to be approached.
Handwheel traversal
When the indexing axis is traversed by means of the handwheel in JOG mode, the indexing
positions are ignored. As the handwheel is turned, the indexing axis moves to any position
depending on the basic system in mm, inches or degrees.
If traversing of the indexing axis with the handwheel is to be interlocked, this can be handled
by the PLC user program.
Signal from PLC "Indexing axis in position"
When the indexing axis is traversed in JOG mode, the signal:V390x 1002.6 (indexing axis in
position) is output at the PLC interface to indicate that an indexing position has been
reached.
This is subject to the condition that the indexing axis has been referenced:
V390x 0000.4 (referenced/synchronized 1) = 1
Alarms in JOG mode
If the indexing axis leaves the traversing range defined in the indexing position table when
traversing in JOG mode, alarm 20054 "Incorrect index for indexing axis in JOG" is output.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Indexing Axes (T1)
21.2 Indexing axes
371