F
3-
-0
8A
D
8-
C
ha
nn
el
A
na
lo
g
In
pu
t
4--18
F3--08AD 8-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 ...
4 to 20mA
For example, if you have measured the
signal at 10mA, 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
16
(A
-
4)
D
=
4095
16
(10mA
-
4)
D
=
(255.93) (6)
D
=
1536
Now you have all the necessary information to get your analog module installed and
operating correctly!
Analog and Digital
Value Conversions
A
=
16D
4095
+
4
D
=
4095
16
(A
-
4)
