Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 280)

Publication 1747-UM011G-EN-P - June 2008
280 Glossary
offline
When a device is not scanning/controlling or when a programming
device is not communicating with the controller.
offset
A continuous deviation of a controlled variable from a fixed point.
off-state current
For input circuits, the maximum amount of leakage current allowed
from an input device in its off-state.
off-state leakage current
When a mechanical switch is opened (off-state), no current flows
through the switch. Semiconductor switches and transient suppression
components which are sometimes used to protect switches, have a
small current flow when they are in the off state. This current is
referred to as the off-state leakage current. To ensure reliable
operation, the off-state leakage current rating must be less than the
minimum operating current rating of the device that is connected.
off-state voltage (max)
The maximum input voltage level detected as an off condition by the
input module.
on-delay time
The on-delay time is a measure of the time required for the controller
logic to recognize that a signal has been presented at the input
terminal of the controller.
one shot
A programming technique that sets a bit ON or OFF for one program
scan.
online
When a device is scanning/controlling or when a programming device
is communicating with the controller.
on-state voltage drop
The voltage developed across the output driver circuit during the
on-state at maximum load current.