Rockwell Automation 1772-AF4,D17726.5.3 User Manual, AUX FUNCT PROM - Manual (Page 50)

Programming
Chapter 3
3Ć42
4. You can enter base y and exponent x values from the keyboard of the
industrial terminal or through ladder diagram functions. Entry of y - 124
in word 200 and 2 - 02.0 in word 201 produces the result 15376 when the
power function executes. Figure 3.41 shows how the result is stored as
1.53(10)
4 . The result is truncated.
Figure 3.41
AF4 Power Function Format After Execution
17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0 Bit No.
Data Address
Result Address
D E
E = Enable Bit (1 = Function in Progress)
D = Done Bit (1 = Function Complete)
11510
S = Sign Bit (1 = Negative)
S
S
ER
S
Base y
Exponent x
Result Base, r
s (Power of 10)
ER = Error Bit (1 = Overflow when y > 9.99(10) ) x 099.
200
201
300
301
1 2 4
0 2 0
1 5 3
0 0 4
(0)
(0)
(0) (1) (0)
(0)