Siemens SINUMERIK 840D sl Function Manual page 151
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Output of alarms with alarm reaction NCK-NoReady
If a serious alarm resulting in dropout of the NCK-Ready relay is activated on an NCU, then
the effects of the alarm will apply to all other NCUs which are addressing an axis via link
communication on the first NCU. An additional alarm which causes all other axes to stop
instantaneously is activated on each of the other NCUs.
For alarm acknowledgement, see EMERGENCY STOP.
Compensation
The following compensations are not available for link axes:
● Sag compensation (CEC)
● Leadscrew error compensation (LEC)
● Quadrant error compensation (QEC)
Switching off grouped NCUs
If an NCU in a link grouping is switched off or restarted by an NCK reset, all the other NCUs
in the link grouping will also be affected. An alarm is generated on these and the process
currently taking place is aborted.
See "Configuration of a link grouping (Page 174)".
Powering up an NCU grouping
If an NCU in a link grouping is restarted by an NCK reset, the other NCUs in the grouping will
also execute an NCK reset.
Nibbling and punching
To execute nibbling and punching operations, high-speed inputs and outputs must be
connected and parameterized on the "interpolation" NCU (on which the part program is
being executed). Commands "High-speed nibbling and punching", e.g. PONS and SONS are
not available for link axes.
Travel to fixed endstop
If an axis container axis is being held against a fixed stop, the axis container cannot rotate.
Axes can travel to fixed stops on different NCUs and be subsequently clamped without
restriction.
Frames
Link axes may be included in the program commands for frames only if they are geometry
axes as well. The command only changes the geometry for the channel in which the axis is
currently assigned. A frame command for an axis which is not defined as a geometry axis is
rejected with alarm 14092.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
Link axes
151
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