User manual

Publication 1747-UM011F-EN-P - May 2007
288 Glossary
sourcing
A term used to describe current flow between two devices. A sourcing
device or circuit provides power.
status
The condition of a circuit or system.
strobe message
A strobe message is a multicast transfer of data sent by the scanner
that solicits a response from each slave device. The devices respond
with their data.
surge current per point
The maximum amplitude and duration (pulse) of current allowed for a
given period of time and temperature.
surge suppressor
A device used to absorb voltage transients created by energizing an
inductive load to reduce electrical noise or to protect the output
circuit. For example, an R-C network, MOV (metal oxide varistor) or
diode.
terminal
A point on an I/O module that external devices, such as a push button
or pilot light, are wired to.
throughput
The time between when an input turns on and a corresponding
output turns on or off. Throughput consists of input delays, program
scan, output delays, and overhead.
token
The logical right to initiate communication. In a multi-master network
a single token is passed between initiators to make sure two nodes do
not transmit at the same time.
true
The status of an instruction that provides a continuous logical path on
a ladder rung.