F
3-
-1
6A
D
16
-C
ha
nn
el
A
na
lo
g
In
pu
t
5--26
F3--16AD 16-Channel Analog Input
Sometimes it is helpful to be able to quickly convert between the signal levels and the
digital values. This is especially helpful during machine startup or troubleshooting.
The following table provides formulas to make this conversion easier.
Range
If you know the digital value ...
If you know the analog signal
level ...
--10V to + 10V
--5V to + 5V
0 to 10V
0 to 20mA
(or 4--20mA)
For example, if you are using the --10 to
+10V range and you have measured the
signal at 6V, you would use the following
formula to determine the digital value
that should be stored in the register
location that contains the data.
D
=
4095
20
(A
+
10)
D
=
4095
20
(6V
+
10)
D
=
(204.75) (16)
D
=
3276
Now you have all the necessary information to get your analog module installed and
operating correctly!
Analog and Digital
Value Conversions
A
=
20D
4095
-
10
D
=
4095
20
(A
+
10)
A
=
10D
4095
-
5
D
=
4095
10
(A
+
5)
A
=
10D
4095
D
=
4095
10
A
A
=
20D
4095
D
=
4095
20
A