Siemens SINUMERIK 840C - Manual (Page 788)

10.94 12 Functional Descriptions
12.3.2 Display of endlessly rotating axis
12.3.2 Display of endlessly rotating axis
The actual value display is the same as that for a rotary axis, i.e. it is dependent on existent
machine data, either absolute or modulo.
The axis-specific G commands can be displayed in all operating modes. A new softkey "Axis-
specific G functions" is provided for this purpose. When this function is selected, the axis-
specific functions are superimposed on the program pointer. The pointer is displayed again
when RECALL is selected.
12.3.3 Reaction of endlessly rotating function to NC-STOP and
NC-RESET
An "endlessly rotating axis" cannot be stopped by means of NC-STOP. To stop an axis
operating in this mode, the appropriate axis must be halted with the axis-specific feedrate stop
command (which is not in this case displayed) when NC-STOP is initiated. The motion of an
"endlessly rotating axis" cannot be stopped by means of a reset operation (key reset, mode
group changeover and M02/M30) either.
Endlessly rotating operation can be interrupted with the new axis-specific signal "Axis reset"
(in DB 32).
The "Endlessly rotating axis" function operates on a multi-channel basis, i.e. requests may
come from several channels which means that it is not possible to automatically derive a stop
or reset command for the appropriate rotary axis from an NC-STOP or RESET command in
one channel.
Note:
In contrast to a leading spindle, the leading axis in a channel is not defined; this means that,
unlike spindles, axes are not clearly assigned to any particular channel.
Through appropriate parameter settings in the PLC user program, the motion of the endlessly
rotating axis can be linked to other axes/spindles, to a channel or to a mode group and can
then be controlled as a function of the process. For this reason, no fixed settings are made by
means of machine data.
EMERGENCY STOP (alarm 2000) as well as all alarms which effect cancellation of the
interface signal "Mode group ready" always lead to shutdown of the "endlessly rotating axis"
(specific to mode group).
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–13
SINUMERIK 840C (IA)