Programming
Chapter 3
327
Figure 3.23
AF1
A
verage Function Format After Address Entry
171615141312111076543210
S
Bit No.
Data Address
Digit 2
Digit 3
(LSD)
Input 1
S
Digit 2 Digit 3
Digit 2 Digit 3Digit 1
S
Digit 1
(MSD)
Digit 2 Digit 3
Result Address
Digit 5Digit 4
Result
DE
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
11586
Digit 6
ER
ER = Error Bit (Set if number of readings = 0)
S
Digit 1
(MSD)
Digit 1
(LSD)
Input 2
Input 3
Number of Inputs
003200
201
202
203
305
306
4. Enter the values of the numbers you wish to average in the input word
addresses. You can enter these numbers from the keyboard of your
industrial terminal or through ladder diagram functions. if we choose to
enter values of +413, +235, and +121 into input word addresses 201, 202,
and 203 respectively, we obtain the result shown in Figure 3.24 when the
average function executes. The result appears in result words 305 and 306
as 256.333.
