GE VersaMax Manual page 319

10
IC200ALG260
Analog Input Module, 12 Bit Voltage/Current 8 Channels
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 2.5mV. If the module receives an increase less than 2.5mV, the previous count value
is still reported. For example:
10-22 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
8192 16384 24576
Count
Current Count
12.190mA 16384
12.192mA 16384
12.199mA 16392
4µA = 8 counts
12.194mA
12.19mA
16384
32767
)
12.202mA
12.198mA
16408
16400
16392
GFK-1504K