Allen-Bradley MicroLogix 1400 User Manual page 395

Glossary
scan time
The time required for the controller to execute the instructions in the program.
The scan time may vary depending on the instructions and each instruction's
status during the scan.
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.
Rockwell Automation Publication 1766-UM001I-EN-P - June 2015 381