Siemens SINUMERIK 840D sl Function Manual page 103

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.
Powering up an NCU group
If an NCK reset is triggered on an NCU in a link group, it will also be transferred to all other
NCUs of the link group so that all NCUs of the link group perform a warm restart.
Nibbling and punching technologies
The fast inputs/outputs required for the nibbling and punching must be connected and
parameterized on the NCU on which the part program is processed and the axes interpolated.
The commands for "High-speed nibbling and punching", e.g. PONS and SONS, are not available
for link axes.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
B3: Distributed systems - 840D sl only
3.2 NCU link
103