Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 114)

114 Rockwell Automation Publication 1769-UM005B-EN-P - March 2012
Glossary
resolution – The smallest detectable change in a measurement, typically
expressed in engineering units (such as 1 °C) or as a number of bits. For
example a 12-bit system has 4096 possible output states. It can therefore
measure 1 part in 4096.
RTD – Resistance temperature detector. A temperature-sensing device that
consists of a temperature-sensing element connected by two, three, or four
lead wires that provide input to the module. The RTD uses the basic concept
that the electrical resistances of metals increase with temperature. When a
small current is applied to the RTD, it creates voltage that varies with
temperature. The module processes and converts this voltage into a
temperature value.
sampling tim e – The time required by the A/D converter to sample an input
channel.
step response time – The time required for the channel data word signal to
reach a specified percentage of its expected final value, given a full-scale step
change in the input signal.
update time – see “module update time”