B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
99
Alarms: Response for "NC not ready" alarm response
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 to the
setpoint-generating NCU via the NCU link and output there. The alarm output is also made
on the home NCU.
Under the assumption that no further practical machining operations are then possible on the
setpoint-generating NCU, an additional alarm will be generated that stops all dependent axis
movements.
Alarm acknowledgement
See alarm acknowledgement under "Alarms: Behavior for emergency stop"
Alarms: Behavior for "Mode group not ready" alarm response
If an error is detected within a mode group with several channels and the relevant alarm has
"Mode group not ready" as response, this causes the traversing movements in all channels
of the mode group to stop. If the traversing movements are generally independent of each
other, the response via the following machine data item can be changed to "Channel not
ready":
MD11412 $MN_ALARM_REACTION_CHAN_NOREADY = TRUE
Effect
In the NC/PLC interface, instead of signal DB11 DBX26.3 (mode group ready), the signal
DB21, DBX36.5 (channel ready), is reset.
Advantage
The alarm response remains limited to the channel in which the error is detected. If required,
the PLC user program can initiate further responses.
Requirement
There is no higher-priority alarm response than "Mode group not ready".
Compensations
The following compensations are not available:
● Link axes: Quadrant error compensation (QEC)
● Container link axes: Sag compensation (CEC)
Switch-off an NCU in a link group
If an NCU in a link group is switched off, the machining on all other NCUs of the link group
will be cancelled and an alarm issued.
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