Rockwell Automation AB quality Allen-Bradley 1746-INT4 User Manual page 112

112 Glossary
Publication 1746-UM614B-EN-P - September 2007
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
This is the time required for the module to process an input signal to
reach 99.9% of its expected final value, given a large step change in
the input signal.
update time
The time for the module to sample and convert a channel input signal
and make the resulting value available to the SLC processor.