Rockwell Automation 1790P-T4T0 CompactBlock LDX I/O Thermocouple Modules User Manual
Page 100
Publication 1790-UM003A-EN-P
G-2
effective resolution – The number of bits in a channel configuration
word that do not vary due to noise.
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.
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.
linearity error – Any deviation of the converted input or actual output
from a straight line of values representing the ideal analog input. An
analog input is composed of a series of input values corresponding to
digital codes. For an ideal analog input, the values lie in a straight line
spaced by inputs corresponding to 1 LSB. Linearity is expressed in percent
full-scale input. See the variation from the straight line due to linearity
error (exaggerated) in the example below.
LSB – Least significant bit. The LSB represents the smallest value within a
string of bits. For analog modules, 16-bit, two’s complement binary codes
are used in the I/O image. For analog inputs, the LSB is defined as the
rightmost bit of the 16-bit field (bit 0). The weight of the LSB value is
defined as the full-scale range divided by the resolution.
module scan time – same as module update time
module update time – The time required for the module to sample and
convert the input signals of all enabled input channels and make the
resulting data values available to the processor.
multiplexer – An switching system that allows several signals to share a
common A/D converter.
Ideal Transfer
Actual Transfer
Function
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