Analog And Digital Value Conversions - Automation Direct DL405 User Manual

6–18
F4–16AD–1 16-Channel Analog Input
Analog and
Digital Value
Conversions
Sometimes it is helpful to be able to quickly convert between the signal levels and
the digital values. This is especially useful during machine startup or
troubleshooting. The following table provides formulas to make this conversion
easier.
Range If you know the digital value ...
0 to 20mA
A + 20D
4 to 20mA
A + 16D
For example, if you are using the 0 to
20mA range and you have measured
the signal at 6mA, you would use the
following formula to determine the digital
value that should be stored in the
V-memory location that contains the
data.
If you know the signal level ...
4095
) 4
4095
D + 4095
(A)
20
D + 4095
(A * 4)
16
D + 4095
(A)
20
D + 4095
(6mA)
20
D + (204.75) (6)
D + 1228