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

11.7.1

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
● Absolute coordinate (G90),
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.
11.7.2

PLC-controlled axes

PLC actions
The table below compares the following PLC actions with the corresponding NCK reactions
for a machine axis 1:
● Start machine axis as PLC axis via FC 18
● Trigger NC Start or NC Stop
● Trigger axial STOP, RESUME or RESET
● Trigger NC-RESET
● Cancel or set servo enable for the machine axis
● Relinquish control of machine axis to NC
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
data MD32060 $MA_POS_AX_VELO):
incremental coordinate (G91),
absolute coordinate along the shortest path for rotary axes (rotary axis name =
DC(value))
P2: Positioning axes
11.7 Control by the PLC
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