Siemens SINUMERIK 840D sl Function Manual page 149

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
Position control
The position control is implemented on the NCU on which the axis is physically connected to
the drive. This NCU also contains the associated axis interface. The position setpoints for
link axes are generated on the active NCU and transferred via the NCU link.
Communication methods
There are two types of link communication:
● Cyclic communication
● Non-cyclic communication
Cyclic communication
● Setpoints for link axis
● Actual values of link axis
● Status signals of link axis
● Status signals of NCUs
are transferred cyclically. Actual values and status signals of a link axis are updated and
made available to the NCU that is interpolating this axis.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
2.6 Link axes
149