Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 161)

Publication 1762-UM001G-EN-P - March 2011
Glossary 9
sinking
A term used to describe current flow between an I/O device and controller
I/O circuit — typically, a sinking device or circuit provides a path to ground,
low, or negative side of power supply.
sourcing
A term used to describe current flow between an I/O device and controller
I/O circuit — typically, a sourcing device or circuit provides a path to the
source, high, or positive side of power supply.
status
The condition of a circuit or system, represented as logic 0 (OFF) or 1 (ON).
terminal
A point on an I/O module that external I/O devices, such as a push button or
pilot light, are wired to.
throughput
The time between when an input turns on and the corresponding output turns
on.
true
The status of an instruction that provides a continuous logical path on a ladder
rung.
upload
Data is transferred to a programming or storage device from another device.
watchdog timer
A timer that monitors a cyclical process and is cleared at the conclusion of
each cycle. If the watchdog runs past its programmed time period, it causes a
fault.
workspace
The main storage available for programs and data and allocated for working
storage.
write
To copy data to a storage device. For example, the processor WRITEs the
information from the output data file to the output modules.