Siemens SINUMERIK 840D Function Manual page 282

G1: Gantry axes
9.7 Miscellaneous points regarding gantry axes
Axis interchange
All axes in the gantry grouping are released automatically in response to a RELEASE
command (guide axis).
An axis interchange of the guide axis of a closed gantry grouping is only possible, if all axes of
the grouping are known in the channel in which they are to be transferred, otherwise alarm
10658 is signaled.
No automatic axis interchange and no automatic adjustment of the gantry axis conditions are
undertaken while trying to reconnect a gantry grouping is released with
MD37140 $MA_GANTRY_BREAK_UP = 1. The user is responsible for this. A check of the axis
conditions is conducted after the break up and if necessary, a corresponding alarm 10658 is
output.
Note
If a gantry grouping is to be closed again, the user must ensure that all axes of the grouping are
in a channel with a corresponding axis condition.
Default for RESET
In an active gantry grouping, the following machine data parameterization is ignored for the
synchronous axes:
MD30450 $MA_IS_CONCURRENT_POS_AX = 1 (Reset default: neutral axis/channel axis)
The state of the guide axis is assumed. The user is informed about the inappropriate
configuration with display alarm 4300.
Display data
The position actual value display shows the actual values of both the guide axis and the
synchronous axes. The same applies to the service display values in the "Diagnosis" operating
area.
Software limit switch
The software limit switch monitor is processed for the guide axis only. If the guide axis crosses
the limit switch, all axes in the gantry grouping are braked to a standstill.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA