Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 180)

EAF Math Instructions
Chapter 14
14-8
This EAF multiplies (or divides) two numbers. Word formats for
multiplication and division are the same. The only difference between the
two EAFs is their function numbers: multiplication is 03 and division is 04.
Both of these functions limit calculations to six digits per operand, stored
anywhere within the 12 available digits.
(+/- xxx xxx . xxx xxx) x or / (+/- xxx xxx . xxx xxx)= +/- yyy yyy . yyy yyy
or
(+/- Operand A) x or / (+/- Operand B) = +/- Result
Enter an EAF rung like that shown in Figure 14.6.
Figure 14.6
EAF Multiplication Input and Result Display Rungs
060
080
EXECUTE AUX
FUNCTION
FUNCTION NUMBER:
DATA ADDR:
RESULT ADDR:
03
040
060
G
061
300
G
062
000
G
063
000
G
040
G
041
400
G
042
000
G
043
000
G
050
000
G
051
G
200
052
000
G
053
000
G
000
Enter the values for Operands A and B. The quotient of the Division EAF
is expressed as a decimal. The first 5 most significant digits are accurate.
Division by zero (including 0/0) gives the result of 999.999 and the
overflow bit is set. This result differs from the PLC-2/20 and PLC-2/30
processors where 0/0 = 1.000.
Entry of Operand A = 000 400 000 000 and Operand B = 000 200 000 000
produces the result 080 000 000 000 for multiplication (Figure 14.6) or
000 002 . 000 000 for division. Figure 14.7 shows how the words are
stored in the data table.
Multiplication and Division