Siemens SINUMERIK 840D sl Function Manual page 830

T1: Indexing axes
16.6 Supplementary conditions
Various channel and axis-specific NC/PLC interface signals
If, while a "Hirth axis" is being traversed, at least one of the following signals occurs, then the
axis stops immediately at the next possible indexing position in the traversing direction.
● 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)
Emergency Stop
If, while a "Hirth axis" is being traversed, an Emergency Stop is initiated then the axis is
immediately stopped:
DB10 DBX56.1 == 1 (Emergency Stop)
References: Function Manual Basic Functions; Chapter "N2: Emergency Stop"
NOTICE
Approaching the indexing position
After an Emergency Stop, before the interlocking of the Hirth gearing at the machine is
reactivated, either the PLC user program or the operator (manually) must first move the "Hirth
axis" to an indexing position in the JOG mode.
Synchronized actions
● Delete distance to go (DELDTG)
If, for a "Hirth axis", the distance to go is deleted with a synchronized action using
DELDTG, then the axis is stopped at the next possible indexing position in the traversing
direction
References: Function Manual Synchronized Actions, Chapter "Detailed description" >
"Actions in synchronized actions" > "Delete distance to go (DELDTG)"
Various axis-specific functions
"Hirth axes" may not be used in conjunction with the following functions:
● Kinematic transformation
References: Function Manual Extended Functions, Chapter "M1: Kinematic transformation"
● Work offset by setting the actual value: PRESETON
References: Programming Manual, Job Planning, Chapter "Coordinate transformations
(frames)"
● Revolutional feedrate (G95, FPRAON)
830
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions