Sample program, 2 instructions – Omron SYSMAC CP CP1E-N@@D@-@ User Manual
Page 210
2 Instructions
2-174
CP1E CPU Unit Instructions Reference Manual(W483)
Subtraction at (1)
Subtraction at (2)
Final Subtraction Result
Sample program
If the result of the subtraction is a negative number (Mi
number, a program which subtracts the result from 0 is necessary, as an input condition of the Carry
Flag (CY). The Carry Flag turning ON thus indicates that the result of the subtraction is negative.
0
1
–
9
7
5
0
8
7
3
2
9
6
6
4
0
1
Mi+1: CIO 201
CY
S1: CIO 200
Su+1: CIO 121
S2: CIO 120
9
2
5
1
1
3
1
9
1
R+1: D101
R+1: D100
09583960+(100000000-17072641)
The Carry Flag (CY) is ON, so the result is subtracted from 0000 0000.
0
–
0
0
0
0
0
0
0
Su+1: D101
Su: D100
9
2
5
1
1
3
1
9
00000000+(100000000-92511319)
CY
0
7
4
8
8
6
8
1
1
R+1: D101
R+1: D100
–
CY
1
R+1: D101
R+1: D100
Mi+1: CIO 201
Mi: CIO 200
Su+1: D101
Su: D100
0
9
5
8
3
9
6
0
1
7
0
7
2
6
4
1
0
7
4
8
8
6
8
1
The Carry Flag (CY) will be turned ON, so the actual number is
– 7,488,681. Because the content of D101 and D100 is negative, CY is
used to turn ON CIO 21.00 to indicate this.
−B
D100
D110
D120
0.00
When CIO 0.00 is ON in the following example, D110 is subtracted from
D100 as 4-digit BCD values, and the result will be output to D120.
−BL
D100
D110
D120
0.00
When CIO 0.00 is ON in the following example, D111 and D110 will be
subtracted from D101 and D100 as 8-digit BCD values, and the result will
be output to D121 and D120.