GE VersaMax Manual page 304

Scaling
The graphs below show the relationship between the input voltage or current measured at
the field terminals and the data that is output by the module.
Count and Input Current
24
mA
20
16
12
8
4
0
0
The following equation can be used to calculate counts values:
Counts = ( Current in mA - 4mA) x (32768 / 16.38mA
For a change in the reported count value to be seen, input current must be increased by at
least 4µA. If the module receives an increase less than 4µA, the previous count value is
still reported. For example:
GFK-1504K Chapter 10 Analog Input Modules
Analog Input Module, 12 Bit Voltage/Current 4 Channels
8192 16384 24576
Count
Current
12.190mA
12.192mA
12.194mA
12.194mA
12.19mA
16384
32767
)
Count
16384
16384
16392
10
IC200ALG230
4µA = 8 counts
12.202mA
12.198mA
16408
16400
16392
10-7