Double 2'S Complement - Negl - Omron CQM1H - PROGRAM Programming Manual

Programmable controllers; inner boards

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Conversion Instructions

5-20-18 DOUBLE 2'S COMPLEMENT – NEGL(––)

Ladder Symbols

DM 6143 to DM 6655 cannot be used for R.

S and S+1 must be in the same data area, as must R and R+1.

Converts the eight-digit hexadecimal content of the source words (S and S+1)

to its 2's complement and outputs the result to the result words (R and R+1).

This operation is effectively the same as subtracting the eight-digit content S

and S+1 from $0000 0000 and outputting the result to R and R+1; it will calcu-

late the absolute value of negative signed binary data.

If the content of S is 0000 0000, the content of R will also be 0000 0000 after

execution and EQ (SR 25506) will be turned on.

If the content of S is 8000 0000, the content of R will also be 8000 0000 after

execution and UF (SR 25405) will be turned on.

Note Refer to 1-7 Calculating with Signed Binary Data for more details.

Indirectly addressed EM/DM word is non-existent.

(Content of *EM/*DM word is not BCD, or the EM/DM area boundary

has been exceeded.)

ON when the content of R+1, R is zero after execution; otherwise

ON when the content of S+1, S is 8000 0000; otherwise OFF.

The following example shows how to use NEGL(––) to find the 2's comple-

ment of the hexadecimal value in IR 151, IR 150 (001F FFFF) and output the

result to HR 04, HR 03.

IR, SR, AR, DM, EM, HR, TIM/CNT, LR

Address Instruction

Section 5-20

Operand Data Areas

S: First source word

R: First result word

IR, SR, AR, DM, EM, HR, LR

Not used. Set to 000.

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