P2: Positioning axes
10.7 Control by the PLC
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
631
A PLC axis with fixed assignment is a "neutral axis" on power up. For a travel request via the
NC/PLC interface, a concurrent positioning axis automatically changes to a PLC axis without
being interchanged beforehand.
Axis replacement via PLC
The type of an axis for axis replacement is transferred to the PLC with axial interface byte
NCK→PLC NST DB31, ... DBB68 (see alsop Section "K5: Mode groups, channels, axis
interchan
ge (Page 305)"):
● IS DB31, ... D
BX68.0-68.3 ("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.
10.7.1 Starting concurrent positioning axes from the PLC
Activation from PLC
When concurrent positioning axes are activated from the PLC, FC18 is called and supplied
with the following parameter data:
● Axis name or axis number
● End position
● Feedrate (with feedrate setting = 0, the feedrate is determined by the setting in machine
data MD32060 $MA_POS_AX_VELO):
● Absolute coordinate (G90),
incremental coordinate (G91),
absolute coordinate along the shortest path for rotary axes (rotary axis name =
DC(value))
The following functions are defined:
● Linear interpolation (G01)
● Feedrate in mm/min or degrees/min (G94)
● Exact stop (G09)
● Settable zero offsets currently selected are valid
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.
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