Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 94)

Publication 1762-UM003A-EN-P - February 2003
4 Glossary
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.
normal mode rejection
(differential mode rejection) A logarithmic measure, in dB, of a
device’s ability to reject noise signals between or among circuit signal
conductors. The measurement does not apply to noise signals
between the equipment grounding conductor or signal reference
structure and the signal conductors.
number of significant bits
The power of two that represents the total number of completely
different digital codes to which an analog signal can be converted or
from which it can be generated.
Ideal Transfer
Actual Transfer
Function