Plc-Controlled Axes - Siemens SINUMERIK 840D sl Function Manual

Positioning Axes (P2)
11.7 Control by the PLC
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
Examples of NCK reactions
PLC actions are shown as NCK reactions in the table below.
PLC actions
Start machine axis 1, residing in 1st channel, as
PLC axis via FC 18
Trigger IS DB21, ... DBX7.4
("NC Stop axes plus spindle")
Trigger IS DB21, ... DBX7.1 ("NC Start")
PLC wants to control machine axis 1,
IS DB31, ... DBX28.7 ==1
("PLC controls axis")
Trigger IS DB21, ... DBX7.4
("NC Stop axes plus spindle")
Trigger axial axis stop
IS DB31, ... DBX28.6 ("AxStop, Stop")
Trigger axial RESUME
IS DB31, ... DBX28.2 ("AXRESUME")
Trigger NC Reset
Trigger IS DB21, ... DBX7.7 ("Reset")
790
NCK reaction
Machine axis 1 is stopped.
Machine axis 1 continues traversal.
Control of machine axis 1 is given to the PLC. IS
DB31, ... DBX63.1==1
("PLC controls axis")
Machine axis 1 is not stopped.
Machine axis 1 is stopped
IS DB31, ... DBX63.2==1 ("axis stop active")
Machine axis 1 continues traversing
IS DB31, ... DBX63.2==0 ("axis stop active")
No effect on machine axis 1
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions