Rockwell Automation 1772-AF4,D17726.5.3 User Manual, AUX FUNCT PROM - Manual (Page 55)

Programming
Chapter 3
3Ć47
AF4 Trigonometric Function Sin xxx.
The AF4 sine function finds the sine of a 3-digit BCD angle. The input angle is
in degrees. The AF4 presents the result as a 6-digit value with an implied
decimal point after the most significant digit.
sin xxx. = +x.xx xxx
How to Enter an AF4 Sine Function
To program an AF4 sine function perform the following steps:
1. Press [SHIFT][EAF] or [SHIFT][SCT} on the keyboard of your industrial
terminal. Figure 3.1 appears on the CRT.
2. Enter 35, the function number for the AF4 sine function.
This entry identifies that the function entered is to perform an AF4 sine
calculation and that the processor use the data table format shown in
Figure 3.47 when executed. The three BCD digits in the operand labeled digit 1
through 3 represent the angle with an implied decimal point after digit 3. The
6-digits in the result are the sine of the angle with an implied decimal point after
digit 1.
Figure 3.47
General AF4 Sine Function Word and Digit Format
17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Digit 1
(MSD)
Digit 2
Bit No.
Data Address
m
Digit 2
Operand
Digit 5
Result Address
n
Result
D E
n + 1
E = Enable Bit (1 = Function in Progress)
S = Sign Bit (1 = Negative)
MSD = Most Significant Digit
LSD = Least Significant Digit
11514
Digit 3
(LSD)
Digit 3
Digit 1
(MSD)
Digit 4
Digit 6
(LSD)
D = Done Bit (1 = Function Complete)
S
S
3. Enter a data address and a result address.
If we enter a data address of 205 and a result address of 310, the AF4
establishes the data table format shown in Figure 3.48. The data address, word
205, is reserved for the three digits of the angle whose sine we want. The result