HEIDENHAIN TNC 306 Technical Manual - Manual (Page 369)

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TNC 416/TNC 406/TNC 306 Commands 7-79
Example:
Initial state: Constant = 1000 (decimal)
Double word D12= 15000 (decimal)
Double word D36= 10 (decimal)
Output O15 = ?
The Accumulator contents and operand contents are shown in decimal notation. The ten-position
Accumulator thus permits the maximum possible Accumulator content of 2 147 483 647.
The Accumulator is again represented in binary notation after program line 5, as the transition to
logic execution occurs here.
Line Instruction Accumulator Contents Operand Contents
1 L D12
x x x x x x x x x x
1 5 0 0 0
1 5 0 0 0
1 0 0 0
Program-stack:
1 5 0 0 0
2 >= [
3 L K1000
4 x D36
5 ]
6 = O15 1
1 0 1 0 0 0 0
1 5 0 0 0
bit 31 . . . 7 0
x x x x 1 x x x x x x x
x x x x 1 x x x x x x x
Line 1: The content of Double word D12 is loaded into the Word Accumulator.
Line 2: Open parentheses: buffering of the Accumulator content in the Program Stack.
Line 3: Loading of a Constant into the Word Accumulator.
Line 4: The content of the Word Accumulator is multiplied by the content of Double word D12.
Line 5: Close parentheses: Word Accumulator content is gated, corresponding to the
command(==[, >=[, <=[ ...) with the content of the Program Stack . The transition from
Word to Logic processing occurs in this program line. The Logic Accumulator is set or
reset, depending on the result of the comparison.
Line 6: The result of the complete logical process is assigned to output O15.