6 unequal (<>) – HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual
Page 539
3.5.6 UNEQUAL (<>)
Abbreviation for PLC Editor:
<> (NOT EQUAL)
Byte/Word/Double
Constant
Execution time [µs]
1.0 to 1.2
0.3 to 0.5
Number of bytes
6
8
Operands: B, W, D, K
Operation:
With this command, a direct transfer from Word to Logic execution occurs. The content of the Word
Accumulator is compared with the content of the addressed operand. If the Word Accumulator and
the operand are not equal, the condition is true and the Logic Accumulator is set to 1. If the Word
Accumulator is equal to the operand, the Logic Accumulator is set to 0. The comparison takes place
over the number of bits corresponding to 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.
Output state
Constant
= 16 000
Doubleword D8 = 15 000
Accumulator and operand contents are entered here in decimal notation. The ten position
Accumulator thus permits the maximum possible Accumulator content (2 147 483 647).
Line Instruction
Accumulator Content
Operand
Content
x
x x x
x x x
x x x
1
L K16000
1 6
0 0 0
Bit
31
.
.
.
7
0
1
<> D8
... x x x x x x 1 x x x x x x x
1 5
0 0 0
2
= M500
... x x x x x x 1 x x x x x x x
1
Line 1:
The constant is loaded into the Word Accumulator.
Line 2:
Contents of the Word Accumulator and operand are compared according to the following
criteria: Word Accumulator <> Operand. If this condition is fulfilled, the Logic Accumulator
is set to 1.
Line 3:
The contents of the Logic Accumulator [result of the comparison] is assigned to
marker M500.