AH500 Programming Manual
6-90
API
Instruction code Operand Function
0210 D NEG P
D
Two’s complement
Device
X Y M S T C HC D L SM SR E PR K 16#
“$” DF
Pulse instruction 16-bit instruction (3 steps)
32-bit instruction (3 steps)
AH500 AH500 AH500
Symbol:
D
：
Device in which the two’s
complement is stored
Word/Double word
Explanation:
1. The instruction is used to convert the negative binary value into the absolute value.
2. Only the instruction DNEG can use the 32-bit counter.
3. Generally, the pulse instructions NEGP and DNEGP are used.
Example 1:
When X0.0 is switched from OFF to ON, all bits in D0 are inverted (0 becomes 1, and 1 becomes 0),
and 1 is added to the result. The final value is stored in the original register D10.
Example 2:
The absolute value of the negative value:
1. When the value of the 15
th
bit in D0 is 1, M0 is ON. (The value in D0 is a negative value.)
2. When M0 is ON, the instruction NEG is used to obtain the two’s complement of the negative
value in D0. (The corresponding positive value is obtained.)
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