Starting Concurrent Positioning Axes From The Plc; Plc-Controlled Axes - Siemens SINUMERIK 840D Function Manual

P2: Positioning axes
6.7 Control by the PLC
Axis interchange via PLC
The type of an axis for axis interchange is transferred to the PLC with axial interface byte
NC→PLC NST DB31, ... DBB68 (see also Function Manual "Basic Functions" Section "K5:
Cross-channel program coordination and channel-by-channel running-in"):
● IS DB31, ... DBX68.0-68.3 ("NC axis/spindle in channel") channels 1 to 10
● IS DB31, ... DBX68.4 ("new type requested by PLC")
● IS DB31, ... DBX68.5 ("axis can be replaced")
● IS DB31, ... DBX68.6 ("neutral axis/spindle")
● IS DB31, ... DBX68.7 ("PLC axis/spindle")
If IS DB31, ... DBX68.5 ("axis can be replaced") = 1, an axis replacement request can be issued
from the PLC.
6.7.1

Starting concurrent positioning axes from the PLC

Traversing an axis in the NC as competing positioning axes from the PLC user program is
realized using block FC18:
The following functions are defined:
● Linear interpolation (G01)
● Feedrate in mm/min or degrees/min (G94)
● Exact stop (G09)
● The active adjustable work offsets are taken into account
Since each axis is assigned to exactly one channel, the control can select the correct channel
from the axis name/axis number and start the concurrent positioning axis on this channel.
Further information
Function Manual PLC; Block descriptions > FC18: SpinCtrl, spindle control
6.7.2

PLC-controlled axes

PLC actions
The table below compares the following PLC actions as response of the NC for a machine axis:
● Start machine axis as PLC axis using FC18
● Initiate NC start or NC stop
● Axis-specific STOP, RESUME or RESET
● Trigger NC-RESET
● Cancel or set controller enable for the machine axis
● Relinquish control of machine axis to NC
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA