7 – 14 HEIDENHAIN Technical Manual TNC 426, TNC 430
7.2 Operands
7.2.1 Overview of Operands
Operand Symbol Address range
Marker M M0 to M4999
M0 to M999 free, are deleted only after entry of the
code number 531210, not by a reset.
M1000 to M3999 free, are deleted upon reset M4000
to M4999 reserved for NC/PLC interface
Input I I0 to I31 (LE); I128 to I152 (machine operating
panel) I64 to I127 (first PL input/output board)
I192 to I255 (second PL)
I256 to I319 (third PL)
I320 to I383 (fourth PL)
Output O O0 to O30 (LE)
O32 to O62 (first PL)
O64 to O94 (second PL)
O128 to O158 (third PL)
O160 to O190 (fourth PL)
Counter C Set counter: C0 to C31
Counter contents: C48 to C79
Counter pulse release: C96 to C127
Timers T Timer start: T0 to T47
Timer is running: T48 to T95 and T96 to T303
Byte
Word
Double word
B
W
D
B0 to B4095 (8 bits)
B0 to B127 free, are deleted only after entry of the
code number 531210, not with a reset
B128 to B2047 reserved for NC/PLC interface
B2048 to B4095 free, are deleted by a reset.
Constant K -2 147 483 647 to +2 147 483 647
String S S0 to S15
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