Siemens Sinumerik 840D sl Programming Manual page 169

20156
MD number
Default setting: -
Changes effective after RESET
Data type: BYTE
Meaning:
MD cannot be changed for SINUMERIK 802D sl.
20380
MD number
Default setting: 0
Changes effective after RESET
Data type: BYTE
Meaning:
MD cannot be changed for SINUMERIK 802D sl.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
EXTERN_GCODE_RESET_MODE
Reset behavior of external G groups
min. input limit: 0
This MD is only evaluated if bit 0 is set in $MC_RESET_MODE_MASK (see there)!
This MD is used to define for each entry in MD $MN_EXTERN_GCODE_RESET_VALUES
(i.e., for each G group), whether a setting according to the MD
$MC_EXTERN_GCODE_RESET_VALUES is taken again for a reset/part program end,
(MD=0) or the momentary current setting is retained (MD=1).
Example of ISO dialect mode:
The normal position of the 14th G group (adjustable work offset) is read from the machine
data $MC_EXTERN_GCODE_RESET_VALUES for each reset/part program end here:
$MC_EXTERN_GCODE_RESET_VALUES[13]=1 ;Reset value of the 14th group is G54
$MC_EXTERN_GCODE_RESET_VALUES(13)=0; Normal position of the 14th G group after
reset/part program end is defined via $MC_EXTERN_GCODE_RESET_VALUES[13]
However, if the current setting of the 14th G group is to be retained beyond reset/part
program end, then we have the following setting:
$MC_EXTERN_GCODE_RESET_VALUES[13]=1 ;Reset value of the 14th group is G54
$MC_G_CODE_GCODE_RESET_VALUES(13)=0; current setting of the 14th G group is
retained even after reset/part program end
TOOL_CORR_MODE_G43/G44
Handling the tool length compensation G43/G44
min. input limit: 1
The machine data is active only for $MN_MM_EXTERN_CNC_LANGUAGE = 1;
If G43/G44 is active, it determines how length compensations programmed with H are
processed.
0: Mode A
the tool length H always operates on the Z axis, independent of the current plane
1: Mode B
The tool length H always operates on one of the three geometry axes, depending on the
active plane, i.e. in:
G17 on the third geometry axis (normally Z)
G18 on the second geometry axis (normally Y)
G19 on the first geometry axis (as a rule X)
Offsets can be installed in all three geometry axes in this mode through multiple
programming, i.e. activation of a component does not delete the possibly already effective
length compensation in a different axis.
2: Mode C
The tool length works independently of the active plane in the axis, which was
simultaneously programmed with H. Moreover, the behavior is as in Variant B.
Protection level: 2/7
Valid as of software version: 6.3
Protection level: 2/7
Valid as of software version: 5.2
Data Description
C.2 Channel-specific machine data
max. input limit: 1
Unit: -
max. input limit: 2
Unit: -
169