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Scaling
The following graphs illustrate the relationship between the input current
measured at the field terminals and the data values for the module.
Count vs 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 to be seen in the reported count value, 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 12 Analog Mixed I/O Modules
Analog Mixed Module, 12 Bit Input Current 4 Channels and
8192
16384
24576
Count
Current
12.190mA
12.192mA
12.194mA
Output Current 2 Channels
8 counts =
4µA
12.194mA
12.19mA
16384
32767
)
Count
16384
16384
16392
12
IC200ALG430
12.202mA
12.198mA
16408
16400
16392
12-7
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