Chapter 14 PLC Function |C200 Series
14-49
API
22 D
MUL
P
S1 S2 D
BIN Multiplication
Bit Devices Word Devices
X Y M K H KnX KnY KnM T C D
S
1
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
S
2
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
D
＊ ＊ ＊ ＊ ＊
Operands:
In 16-bit instruction, D occupies 2 consecutive devices.
16-bit command (7 STEPS)
MUL
MULP
32-bit command (13 STEPS)
－ － － －
Flag signal: None
Explanation
1.
S
1
: Multiplicand S
2
: Multiplication D: Product
2. This instruction multiplies S
1
by S
2
in BIN format and stores the result in D.
Be careful with the positive/negative signs of S
1
, S
2
and D when doing 16-bit
and 32-bit operations.
16-bit command:
S1
D
b15..........b0
X
b15..........b0
S2
=
b31..........b16b15..............b0
D+1
b15 is a symbol bit b15 is a symbol bit
b31 is a symbol bit (b15 of D+1)
Symbol bit = 0 refers to a positive value.
Symbol bit = 1 refers to a negative value.
When D serves as a bit device, it can designate K1 ~ K4 and construct a 16-bit result,
occupying consecutive 2 groups of 16-bit data.
Example
The 16-bit D0 is multiplied by the 16-bit D10 and brings forth a 32-bit product. The
higher 16-bit are stored in D21 and the lower 16-bit are stored in D20. On/Off of the
most left bit indicates the positive/negative status of the result value.
X0
D0 D10
D20
MUL
D0 D10
K8M0
MUL
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