HEIDENHAIN TNC 430 PA - Greater than (>)

7 – 122 HEIDENHAIN Technical Manual TNC 426, TNC 430
7.7.34 GREATER THAN (>)
Syntax: > (GREATER THAN)
Operands: B, W, D, K
Action:
This command sets off a direct transition from word to logical processing.
Gate the content of the word accumulator with the content of the addressed
operand. If the word accumulator is greater than the operand, the condition is
true and the TNC sets the logic accumulator to 1. If the word accumulator is
less than or equal to the operand, it sets the logic accumulator to 0. The
comparison takes place over the number of bits in the operand,
where B = 8 bits, W = 16 bits, and D = K = 32 bits.
Example:
Compare a constant with the content of double word D8, and assign the result
to marker M500.
Initial state:
Constant = 16 000 (dec)
Double word D8 = 15 000 (dec)
Marker M500 = ?
To improve clarity, the contents of the accumulator and operand are shown in
decimal notation. The ten-digit accumulator results from the greatest possible
accumulator content (2 147 483 647).
Function STL Accumulator contents (dec or [bit]) Operand content
(dec or [bits])
x xxx xxx xxx
Load the constant
into the word
accumulator.
L
K16000
16 000
31..15 ..................... 7 ................. 0
Check whether word
accumulator >
operand; if so, set
logic accumulator to
1.
> D8 x ..... x xxxxxxx1xxxxxxx 15 000
Assign the result to
marker M500.
= M500 x ..... x xxxxxxx1xxxxxxx 1