Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 104)

Publication 1746-UM022B-EN-P - January 2005
Glossary 2
Configuration word
Contains the channel configuration information needed by the module
to configure and operate each channel. Information is written to the
configuration word through the logic supplied in your ladder
program.
Cut-off frequency
The frequency at which the input signal is attenuated 3 dB by the
digital filter. Frequency components of the input signal that are below
the cut-off frequency are passed with under 3 dB of attenuation for
low-pass filters.
dB (decibel)
A logarithmic measure of the ratio of two signal levels.
Data word
A 16-bit integer that represents the value of the analog input channel.
The channel data word is valid only when the channel is enabled and
there are no channel errors.
Digital filter
A low-pass filter of the A/D converter. The digital filter provides
high-frequency noise rejection.
Effective resolution
The number of bits in the channel data word that do not vary due to
noise.
Full-scale error (gain error)
The difference in slope between the actual and ideal analog transfer
functions.
Full-scale range (FSR)
The difference between the maximum and minimum specified analog
values.
Gain drift
The change in full-scale transition voltage measured over the
operating temperature range of the module.