Omron CQM1H - PROGRAM

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Conversion Instructions Section 5-20
5-20-18 DOUBLE 2’S COMPLEMENT – NEGL(––)
Limitations 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.
Description 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.
Flags ER 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.)
EQ: ON when the content of R+1, R is zero after execution; otherwise
OFF.
UF: ON when the content of S+1, S is 8000 0000; otherwise OFF.
Example 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.
S: First source word
IR, SR, AR, DM, EM, HR, TIM/CNT
, LR
Ladder Symbols Operand Data Areas
R: First result word
IR, SR, AR, DM, EM, HR, LR
NEGL(−−)
S
R
000
@NEGL(−−)
S
R
000
000
Not used. Set to 000.
00000 LD 00000
00001 NEGL(−− )
150
LR 03
000
Address Instruction Operands
NEGL(−−)
150
LR 03
000
00000
0000
001F
FFE0
−
0000
FFFF
0001
S+1: IR 151 S: IR 150
R+1: LR 04 R: LR 03