HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 397)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 397
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Definition of constants—CONST
Possibilities of defining constants:
 Direct assignment of values
 Internal interpreter information as constants
 Assignment of names to the transfer variables of subprograms
Use the following internal information to define constants in the
CONST section.
Example: Main program
%abc.nc
CONST
_square_root2 = 1.414213 [direct value
assignment]
_square_root_2 = SQRT(2) [direct value
assignment]
_posx = __n0_x [internal information]
VAR
. . .
BLANK
N..
FINISHED PART
N..
MACHINING
N..
. . .
Example: Subprogram
%SP1.ncS
CONST
_start_x=__la [subprogram transfer value]
_posx = __n0_x [internal constant]
VAR
#_wo = #c1 [tool orientation]
MACHINING
N.. #_wo = #w0(WTL)
N.. G0 X(#_posx*2)
N.. G0 X#_start_x
. . .
Internal information for defining constants
__n0_x 768 Last programmed position X
__n0_y 769 Last programmed position Y
__n0_z 770 Last programmed position Z
__n0_c 771 Last programmed position C
__n40_g 774 Status of TRC
__n148_o 776 Active wear compensation
__n18_g 778 Active working plane
__n120_x 787 Reference diameter X for calculating CY
__n52_g 790 Oversize G52_Geo taken into account 0=no /
1=yes
__n57_x 791 Oversize in X
__n57_z 792 Oversize in Z
__n58_p 793 Equidistant oversize
__n150_x 794 Cutting width shifted in X by G150/G151
__n150_z 795 Cutting width shifted in Z by G150/G151
__n95_g 799 Programmed feed type _G93/G94/G95)
__n95_q 796 Spindle number of the programmed feed rate
__n95_f 800 Last programmed feed rate
__n97_g Programmed speed type _G96/G97)
__n97_q 797 Spindle number of the programmed speed type
__n97_s Last programmed speed
__la-__z Subprogram transfer values
The constant "_pi" is predefined to the value
3.1415926535989 and can be used directly in every NC
program.