IDEC MicroSmart - Manual (Page 235)

11: B INARY A RITHMETIC I NSTRUCTIONS
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Example: SUB
• Data Type: Word
The following example demonstrates the use of special internal relay M8003 to process a borrow.
Examples: MUL
• Data Type: Word
• Data Type: Integer
Note: Since the destination uses two word operands in the multiplication operation, data register D399 (10-I/O type CPU
module) or D1299 (other CPU modules) cannot be used as destination operand D1. When using a bit operand such as inter-
nal relay for destination, 32 internal relays are required; so internal relay M281 (10-I/O type CPU module) or M1241 (other
CPU modules) or a larger number cannot be used as destination operand D1.
Examples: DIV
• Data Type: Word
• Data Type: Integer
Note: Since the destination uses two word operands in the division operation, data register D399 (10-I/O type CPU module)
or D1299 (other CPU modules) cannot be used as destination operand D1. When using a bit operand such as internal relay
for destination, 32 internal relays are required; so M281 (10-I/O type CPU module) or M1241 (other CPU modules) or a
larger number cannot be used as destination operand D1.
I0
SOTU
M8003
D12 – 7000
→ D12
To process borrowing so that the number of times
a borrow occurs is subtracted from D13.
When a borrow occurs, D13 is decremented by
one.
REP S2 –
7000
D1 –
D12
S1 –
D12
SUB(W)
REP S2 –
1
D1 –
D13
S1 –
D13
SUB(W)
I1
REP S2 –
D20
D1 –
D30
S1 –
D10
MUL(W)
D10
× 300000
(000493E0h)
500
(01F4h)
600
(0258h)
D20 D30·D31
When input I1 is on, data of D10 is multiplied by data of D20, and the result is set to
D30 and D31.
D31
37856
(93E0h)
D30
4
(0004h)
I1
REP S2 –
D20
D1 –
D30
S1 –
D10
MUL(I)
D10
× –300000
(FFFB6C20h)
–500
(FE0Ch)
600
(0258h)
D20 D30·D31
D31
27680
(6C20h)
D30
65531
(FFFBh)
When input I2 is on, data of D10 is divided by data of D20. The quo-
tient is set to D30, and the remainder is set to D31.
I2
REP S2 –
D20
D1 –
D30
S1 –
D10
DIV(W)
Quotient Remainder
50 D10 ÷ 7 D30 7 D20 1 D31
I2
REP S2 –
D20
D1 –
D30
S1 –
D10
DIV(I)
Quotient Remainder
50 D10 ÷ –7 D30 –7 D20 1 D31