Rockwell Automation 1772-AF4,D17726.5.3 User Manual, AUX FUNCT PROM - Manual (Page 31)

Programming
Chapter 3
3Ć23
Figure 3.14
General AF4 Division Function Word and Digit Format
17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
S
Digit 1
(MSD)
Digit 2 Digit 3
Bit No.
Data Address
m
Digit 5
Digit 6
Digit 4
(LSD)
Operand 1
S
Digit 1
(MSD)
Digit 2 Digit 3
Digit 5
Digit 6
Digit 4
(LSD)
Operand 2
S
Digit 1
(MSD)
Digit 2 Digit 3
Result Address
n
Digit 5 Digit 4
Result
D E
m + 1
m + 2
m + 3
n + 1
E = Enable Bit (1 = Function in Progress)
S = Sign Bit (1= Negative)
D = Done Bit (1 = Function Complete)
MSD = Most Significant Digit
LSD = Least Significant Digit
11490
Digit 8 Digit 9
Digit 11
Digit 12
Digit 10
(LSD)
Digit 6
Digit 7 n + 2
n + 3
ER
ER = Illegal Operand (Divide by Zero)
3. Enter a data address and a result address.
If we enter a data address of 201 and a result address of 305, the AF4
establishes the data table format shown in Figure 3.15. The data address
eventually contains the most significant three digits of operand 1. The AF4
reserves the next three higher addresses for the least significant three digits of
operand 1 and the six digits of operand 2. The result address contains the most
significant three digits of the result. The AF4 reserves the next three higher
addresses for the remaining nine digits of the result.