Siemens SINUMERIK 828D Function Manual page 696

K2: Axis Types, Coordinate Systems, Frames
10.2 Axes
MD20118 $MC_GEOAX_CHANGE_RESET
Value Significance
0 The current configuration of the geometry axes remains unchanged on reset and program
start. With this setting, the response is identical to older software versions without geometry
axis replacement.
1 The configuration of the geometry axis remains unchanged during reset or parts program
end as a function of machine data MD20110 $MC_RESET_MODE_MASK and during parts
program start as a function of machine data MD20112 $MC_START_MODE_MASK
(definition of initial control system settings with NC START) or brought to the initial status
defined in the machine data MD20050 $MC_AXCONF_GEOAX_ASSIGN_TAB (assignment
of geometry axis to channel axis).
Program start
Analogously to the Reset response, the behavior during program start is based on the setting in the machine
data:
MD20112 $MC_START_MODE_MASK (definition of initial control system settings with NC-START)
Bit Value Significance
12 0 A modified geometry axis assignment remains active on part-program start.
1 A modified geometry axis assignment is cleared on part-program start.
Approaching a reference point
When the "Reference point approach" mode is selected, the geometry axis configuration defined by the machine
data is automatically set.
M code
A changeover of the geometry axis with GEOAX( ) can be communicated to the PLC through the output of an M
code:
MD22532 $MC_GEOAX_CHANGE_M_CODE (M-Code during tool holder change)
Note
If this machine data is set to one of the values 0 to 6, 17, 30, then no M code is output.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions