GE VersaMax IC200CHS022 - Page 348

GFK-1504N Chapter 10 Analog Input Modules 10-33
10
IC200ALG262
Analog Input Module, 15 Bit Differential Current 8 Channels
Scaling
The following figure illustrates the relationship between the input current
measured at the field terminals and the data that is output by the module.
12.1935mA
0 8192 16384 24576 32767
Count
24
20
16
12
8
4
0
mA
12.1925mA
12.193mA
16386
16385
16384
12.192mA
0.5µA = 1counts
10.241875mA
10.240625mA
10.24125mA
16386
16385
16384
10.240mA
0.625µA = 1counts
0
-20mA Range
4-20mA Range
Note 2) 4
-20mA Range
20.000mA
32000
20.3835mA
32767
20.384mA
32000
Note 1) 4-20mA Range
4.000mA
0
4.077mA
154
4.0765mA
0
The following equations can be used to calculate count values:
4-20mA Range: Counts = (Current in mA - 4mA) x (32000 / 16mA)
0-20mA Range: Counts = (Current in mA ) x (32000 / 20mA)
Note 1: In 4-20mA mode, signal inputs below 4.077mA are converted to zero counts.
Note 2: In 4-20mA mode, signal inputs at 20.000mA or above 20.383mA are
converted to 32000 counts.
Operating Range