GFK-1504K
Chapter 12 Analog Mixed I/O Modules
12-7
12
IC200ALG430
Analog Mixed Module, 12 Bit Input Current 4 Channels and
Output Current 2 Channels
Scaling
The following graphs show the relationship between the input current measured at the field
terminals and the data values for the module.
Count vs Input Current
12.202mA
0 8192 16384 24576 32767
Count
24
20
16
12
8
4
0
mA
12.194mA
12.198mA
16408
16400
16392
16384
12.19mA
8 counts =
4µA
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 4
µ
A. If the module receives an increase less than 4
µ
A, the previous count value is
still reported. For example:
Current
Count
12.190mA
16384
12.192mA
16384
12.194mA
16392
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