Specifications

Analog Input Modules
31007715 6/2008 183
These parameters are provided only for sensor compensation, not for scaling. The
module is able to measure over the physical range of 4 to 20 mA or 0 to 20 mA. An
offset adjustment is performed on the low end of the range, and a max count
adjustment is performed on the high end of the range.
Operating Range 4 to 20 mA
In the 4 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 4 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
4mA 64 0
16 mA 23 824 24 000
20 mA 31 744 32 000
C
n
= (I
ai
- 4 mA) x 2000
64
32 001
32 767
<4 mA
12 mA
20 mA
20.38 mA
31 744
c
a
l
i
b
r
a
t
e
d
u
n
ca
li
bra
t
ed
C
n
I
ai
16 mA
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