Rockwell Automation 1746-NI16V SLC 500 Analog I/O Modules - Manual (Page 13)

SLC 500™ Analog Input Modules 13
Publication 1746-IN001B-US-P
Input Devices
Transducer Source Impedance
If the source impedance of the input device and associated cabling is too high, it will
affect the accuracy of the channel data word. Source impedance of 2000 ohms will
produce up to 0.01% of module error over and above the specified accuracy of the
module.
You can compensate for device impedance error by implementing the following
equation in your ladder program:
V
S
V
measured
(R
s
R
in
)
R
in
where:
Vs = input device voltage
Rs = input device impedance
Rin = 1746-NI16 input impedance
(See Specifications on page 17)
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