Less Than - HEIDENHAIN TNC 415 Technical Manual

3.5.2 LESS THAN (<)
Abbreviation for the PLC-Editor:
Execution time [µs]
Number of bytes
Operands: B, W, D, K
Operation:
With this command, a direct transfer from Word to Logic processing occurs. The contents of the
Word Accumulator are compared with the contents of the addressed operand. If the Word
Accumulator is smaller than the operand, the condition is true and the Logic Accumulator is set to 1.
If the Word Accumulator is smaller or equal to the operand, the Logic Accumulator is set to 0. The
comparison takes place over the number of bits in the operand, i.e. B = 8 bit, W = 16 bit and
D = K = 32 bit.
Example:
A constant is to be compared with the contents of Doubleword D8. The result is then assigned to
Marker M500.
Initial state:
The Accumulator and operand contents are shown in decimal notation. The 10 bit wide Accumulator
allows the entry of the highest possible Accumulator contents (2 147 483 647).
Line Instruction
1 L K16000
Bit
1 < D8
2 = M500
Line 1: The constant is loaded into the Accumulator
Line 2: The contents of the Accumulator and the Operand are compared
(Accumulator < Operand ?).
As the condition is not fulfilled the Logic Accumulator is set to 0.
Line 3: The contents of the Logic Accumulator (The result of the comparison) are
assigned to Marker M500.
7-74 TNC 407/TNC 415/TNC 425
< (LESS THAN)
Byte/Word/Double
1.0 to 1.2
6
Constant = 16 000
Doubleword D8 = 15 000
Accumulator Contents
x x x x
31 . . .
... x x x x x x 0 x x x x x x x
... x x x x x x 0 x x x x x x x
3 Commands
Constant
0.3 to 0.5
8
x x x x x x
1 6 0 0 0
7 0
Operand Contents
1 5 0 0 0
0
01.98