Allen-Bradley MicroLogix 1200 User Manual page 150

Glossary 6
Publication 1762-UM001D-EN-P - March 2004
network
A series of stations (nodes) connected by some type of
communication medium. A network may be made up of a single link
or multiple links.
nominal input current
The current at nominal input voltage.
normally closed
Contacts on a relay or switch that are closed when the relay is
de-energized or the switch is deactivated; they are open when the
relay is energized or the switch is activated. In ladder programming, a
symbol that allows logic continuity (flow) if the referenced input is
logic "0" when evaluated.
normally open
Contacts on a relay or switch that are open when the relay is
de-energized or the switch is deactivated. (They are closed when the
relay is energized or the switch is activated.) In ladder programming, a
symbol that allows logic continuity (flow) if the referenced input is
logic "1" when evaluated.
off-delay time
The OFF delay time is a measure of the time required for the
controller logic to recognize that a signal has been removed from the
input terminal of the controller. The time is determined by circuit
component delays and by any filter adjustment applied.
offline
Describes devices not under direct communication.
offset
The steady-state deviation of a controlled variable from a fixed point.
off-state leakage current
When an ideal mechanical switch is opened (off-state) no current
flows through the switch. Practical semiconductor switches, and the
transient suppression components which are sometimes used to
protect switches, allow a small current to flow when the switch is 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 of a