Specifications

Analog Input Modules
184
31007715 6/2008
Operating Range 0 to 20 mA
In the 0 to 20 mA operating range, an ideal linear representation of analog input
current (one with default offset and maximum count) is given by the following
formula:
where C
n
is the numerical count and I
ai
is the analog input current.
For example, if you use the Advantys configuration software to calibrate an offset of
+64 at 0 mA and a max count of 31 744 at 20 mA, the system could be represented
as follows:
Here are some current representations after calibration with offset and max count:
I
ai
Uncalibrated Calibrated
0mA 64 0
15 mA 23 824 24 000
20 mA 31 744 32 000
C
n
= I
ai
x 1600
64
32 001
32 767
0mA
10 mA
20 mA
20.48 mA
31 744
c
a
l
i
b
r
a
t
e
d
un
c
alibrated
C
n
I
ai
15 mA
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