Mitsubishi Electric MELDAS C6 Programming Manual page 176

(3) The positive/negative of the data in S1, S2, S and D is determined with the highest-order bit
(B15).
B15
positive/negative
0
1
(4) The carry flag will not turn ON if the 0 bit underflows.
Execution conditions
The execution conditions for -, -P are as shown below.
Subtraction command OFF
-
-P
Program example
(1) Program to subtract the D10 BIN data from D3 and output to D20.
M0
10
(ON)
(2) Program to output the difference of the timer T3 setting value and current value to D20 BCD data.
X3
10
M0
13
(ON)
8. Function Commands
Judgment of
Positive
Negative
ON
Executed per scan
-
D3
D10
T3 K18000
MOV K18000 D2
-
D2 T3
BCD D3
- 167 -
Get other manuals https://www.bkmanuals.com
–, –P
Executed per scan
Coding
No. of
steps
D20
10
11
15
Coding
No. of
steps
10
11
13
D3
14
17
D20
21
24
Com-
Device
mand
LD M0
- D3 D10 D20
Com-
Device
mand
LD X3
K18000
OUT T3
LD M0
K18000
MOV D2
- D2 T3 D3
BCD D3 D20