Omron C200HX Manuel D’Utilisation

S: Source word

IR, SR, AR, DM, HR, TC, LR, #

R: Result word

IR, SR, AR, DM, HR, LR

NEG(––)

S

R

Converts the four-digit hexadecimal content of the source word (S) to its 2’s
complement and outputs the result to the result word (R). This operation is effec-
tively the same as subtracting S from 0000 and outputting the result to R.

If the content of S is 0000, the content of R will also be 0000 after execution, and
EQ (SR 25506) will be turned on.

If the content of S is 8000, the content of R will also be 8000 after execution, and
UF (SR 25405) will be turned on.

Note Refer to page 27 for details on 16-bit signed binary data.

Indirectly addressed DM word is non-existent. (Content of 

DM word is

not BCD, or the DM area boundary has been exceeded.)

ON when the content of S is 0000; otherwise OFF.

ON when the content of S is 8000; otherwise OFF.

ON when bit 15 of R is set to 1; otherwise OFF.

The following example shows how to use NEG(––) to find the 2’s complement of
the hexadecimal value 001F and output the result to DM 0020.

NEG(––)

#001F

DM 0020

---

00000

00000

LD

00000

00001

NEG(––)

#

001F

DM

0020

#0000

#001F

#FFE1

–

Output to DM 0020.