Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 405

Symbol Math Instructions
Description
Flags
Precautions
Examples
3-10-19 UNSIGNED BINARY MULTIPLY: *U(422)
Purpose
Ladder Symbol
372
Area
Index Registers
Indirect addressing
using Index Registers
*L(421) multiplies the signed binary values in Md and Md+1 and Mr and Mr+1
and outputs the result to R, R+1, R+2, and R+3.
Md + 1
Mr + 1
R + 3 R + 2 R + 1
Name Label
Error Flag ER
Equals Flag =
Negative Flag N
When *L(421) is executed, the Error Flag will turn OFF.
If as a result of the multiplication, the content of R, R+1, R+2, R+3 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 is 1,
the Negative Flag will turn ON.
When CIO 0.01 is ON in the following example, D201, D200 and D211, D210
will be multiplied as 8-digit signed hexadecimal values and the result will be
output to D220 to D223.
0.01
D200
D210
D220
Multiplies 4-digit unsigned hexadecimal data and/or constants.
*U(422)
Md: Multiplicand word
Md
Mr: Multiplier word
Mr
R
R: Result word
Md
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
(Signed binary)
Md
(Signed binary)
Mr
(Signed binary)
R
Operation
OFF
ON when the result is 0.
OFF in all other cases.
ON when the leftmost bit of the result is 1.
OFF in all other cases.
Section 3-10
Mr R