Mitsubishi Electric MELDAS C6 Programming Manual page 178

(2) -2147483648 to 2147483647 (BIN 32-bit) can be designated in S1, S2 and S.
(3) The positive/negative of the data in S1, S2, S and D is determined with the highest-order bit
(B31).
B31
positive/negative
0
1
(4) The carry flag will not turn ON if the 0th bit underflows.
Execution conditions
The execution conditions for D-, D-P are as shown below.
Subtraction command OFF
D-
D-P
Program example
(1) Program to subtract the D0, 1 data from the D10, 11 data when X1 turns ON, and output the
results to D99, 100. Program to subtract the D0, 1 data from D10, 11 data when X2 turns ON, and
output the results to D97, 98.
X1
10
X2
15
8. Function Commands
D–, D–P
Judgment of
Positive
Negative
ON
Executed per scan
D- D10
D-
D10
- 169 -
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Executed per scan
Subtract D0, 1 from D10,11,
D0 D99
and store the results in D99,100
Subtract D0, 1 from D10,11,
D0 D97
and store the results in D97,98
Coding
No. of
steps
10 LD
11 D-
15 LD
16 D-
20
Com-
Device
mand
X1
D10 D0 D99
X2
D10 D0 D97