461
Symbol Math Instructions Section 3-11
Flags
Precautions When *(420) is executed, the Error Flag will turn OFF.
If as a result of the multiplication, the content of R is 0000 hex, the Equals
Flag will turn ON.
If as a result of the multiplication, the content of the leftmost bit of R+1 and R
is 1, the Negative Flag will turn ON.
Examples When CIO 000000 is ON in the following example, D00100 and D00110 will
be multiplied as 4-digit signed hexadecimal values and the result will be out-
put to D00120.
Example in Function Block Definition
In the following example, an array variable is used to get the result from the
function block as one word.
3-11-18DOUBLE SIGNED BINARY MULTIPLY: *L(421)
Purpose Multiplies 8-digit signed hexadecimal data and/or constants.
Ladder Symbol
Variations
Name Label Operation
Error Flag ER OFF
Equals Flag = ON when the result is 0.
OFF in all other cases.
Negative Flag N ON when the leftmost bit of the result is 1.
OFF in all other cases.
*
a
b
tmp[0]
MOV
tmp[0]
c
a * b → c
Function Block Variables
Multiplicand: a (data type: INT)
Multiplier: b (data type: INT)
Result: c (data type: INT)
Temporary variable: tmp (data type: WORD, 2-element array
*L(421)
R
Md
Mr
Md: 1st multiplicand word
Mr: 1st multiplier word
R: 1st result word
Variations Executed Each Cycle for ON Condition *L(421)
Executed Once for Upward Differentiation @*L(421)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
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