Allen-Bradley MicroLogix 1200 Reference Manual page 411

Glossary 5
modem
Modulator/demodulator. Equipment that connects data terminal
equipment to a communication line.
modes
Selected methods of operation. Example: run, test, or program.
negative logic
The use of binary logic in such a way that "0" represents the desired
voltage level.
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 typical amount of current seen at nominal input voltage.
normally closed
Contacts on a relay or switch that are closed when the relay is
de-energized or deactivated. They are open when the relay is energized
or the switch is activated.
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.
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 applied filter.
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 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.
Publication 1762-RM001C-EN-P