Supplementary Conditions - Siemens SINUMERIK 840D sl Function Manual

16.6

Supplementary conditions

Indexing axes
Various channel and axis-specific NC/PLC interface signals
If, while an indexing axis is traversed, at least one of the following signals occurs, then the axis
stops immediately. The indexing positions are not taken into account.
● Channel-specific signals
– DB21, ... DBB4 == 0 (feedrate correction)
– DB21, ... DBX6.2 == 1 (delete distance-to-go)
– DB21, ... DBX7.3 == 1 (NC Stop)
– DB21, ... DBX7.4 == 1 (NC Stop axes plus spindles)
– DB21, ... DBX7.7 == 1 (reset)
● Axisspecific signals
– DB31, ... DBX4.3 == 1 (feedrate stop)
Synchronized actions
● Stop (MOV=0)
If an indexing axis is stopped with a synchronized action using MOV=0, then the axis stops
in the traversing direction at the next possible indexing position
● Delete distance to go (DELDTG)
If, for an indexing axis, the distance to go is deleted with a synchronized action using
DELDTG, then the axis is immediately stopped without stopping at an indexing position
References: Function Manual Synchronized Actions
Frames and work offsets
In conjunction with indexing axes, generally frames are not necessary. As a consequence, we
recommend that frames and work offsets for indexing axes are suppressed in NC programs.
Software limit switch
When manually traversing an indexing axis in the JOG or JOG/INC operating mode, the
indexing axis traverses – as a maximum up – to the last indexing position before the software
limit switch.
Traversing using the handwheel (DRF)
When traversing an indexing axis using the handwheel, the indexing positions are not taken
into account. This means that the indexing axis stops immediately, also between two indexing
positions, with the end of the handwheel pulse.
"Hirth axes"
In addition to the secondary conditions mentioned above, for "Hirth axes" the following
additional secondary conditions must be observed.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
T1: Indexing axes
16.6 Supplementary conditions
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