B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
98 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Output of the axis-specific auxiliary functions
● DB31, ... DBD78 (F function for axis)
● DB31, ... DBW86 (M function for spindle)
● DB31, ... DBD88 (S function for spindle)
References
Detailed information about the auxiliary function output can be found in:
Function Manual, Basic Functions, "Help function outputs to the PLC (H2)" section
2.2.3.5 Supplementary conditions
Maximum number of machine axes
Even for the use of link axes, as previously, the maximum number of concurrently-usable
geometry and special axes as well as machine axes are still available for each NCU type.
"Lead link axes and "link axes" functions
As the functions "lead link axes" and "link axes" require different settings in machine data
MD18720 $MN_MM_SERVO_FIFO_SIZE, they cannot be used within a link group at the
same time.
Alarms: General behavior
If an error is detected at the position control level of the home NCU of a link axis and the
relevant alarm does not have "NC not ready" as response, the alarm is transferred via the
NCU link to the setpoint-generating NCU and then output.
Alarms: Behavior for emergency stop
If an emergency stop request is activated for an NCU via the NC/PLC interface, all axes
physically connected to this NCU will be switched to the "follow-up" mode. This also affects
link axes whose setpoints are currently generated by other NCUs. Under the assumption that
no further practical machining operations are then possible on these NCUs, an additional
alarm will be generated that stops all dependent axis movements.
Alarm acknowledgement
This additional alarm must be acknowledged by an NC reset. If the original alarm is still
active at this time, although the additional alarm can be acknowledged, an additional self-
clearing alarm will be generated that prevents a traversal of the axes or a program start until
the original alarm has been acknowledged.
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