Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 112)

112 Rockwell Automation Publication 1769-UM005B-EN-P - March 2012
Glossary
data word – A 16-bit integer that represents the value of the input channel.
The channel data word is valid only when the channel is enabled and there are
no channel errors. When the channel is disabled the channel data word is
cleared (0).
dB – (decibel) A logarithmic measure of the ratio of two signal levels.
digital filter – A low-pass filter incorporated into the A/D converter. The
digital filter provides very steep roll-off above it’s cut-off frequency, which
provides high frequency noise rejection.
effective resolution – The number of bits in a channel configuration word
that do not vary due to noise.
excitation current – A user-selectable current that the module sends through
the input device to produce an analog signal that the module can process and
convert to temperature (RTD) or resistance in ohms (resistance device).
filter – A device that passes a signal or range of signals and eliminates all
others.
filter frequency – The user-selectable frequency for a digital filter.
full-scale – The magnitude of input over which normal operation is
permitted.
full-scale range – The difference between the maximum and minimum
specified analog input values for a device.
gain drift – Change in full-scale transition voltage measured over the
operating temperature range of the module.
input data scaling – Data scaling that depends on the data format selected
for a channel configuration word. Scaling is selected to fit the temperature or
voltage resolution for your application.
input image – The input from the module to the controller. The input image
contains the module data words and status bits.