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Scaling
The following graphs illustrate 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 / 16.35mA
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-1504N
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
4µA = 8 counts
12.194mA
12.19mA
16384
32767
)
Count
16384
16384
16392
10
IC200ALG230
12.202mA
12.198mA
16408
16400
16392
10-7
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