Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module User Manual - Manual (Page 111)

Publication 1746-UM003A-EN-P
Glossary 3
resolution resolution resolution resolution - The smallest detectable change in a measurement, typically
expressed in engineering units (e.g., 0.1 °C) or as a number of bits. For
example, a 12-bit system has 4,096 possible output states. It can, therefore,
measure 1 part in 4096.
RTD (Resistance Temperature Detector) RTD (Resistance Temperature Detector) RTD (Resistance Temperature Detector) RTD (Resistance Temperature Detector) - A temperature sensing element
with 2, 3 or 4 lead wires. It uses the basic characteristic that electrical resistance
of metals increases with temperature. When a small current is applied to the
RTD, it creates a voltage that varies with temperature. This voltage is processed
and converted by the RTD module into a temperature value.
sampling time sampling time sampling time sampling time - The time required by the A/D converter to sample an input
channel.
status word status word status word status word - Contains status information about the channel’s current
configuration and operational state. You can use this information in your
ladder program to determine whether the channel data word is valid.
step response time step response time step response time step response time - This is the time required for the A/D input signal to
reach 100% of its expected final value, given a large step change in the input
signal.
update time update time update time 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 SLC processor.