Industrial Electronics Glossary

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network A series of stations (nodes) connected by some type of communication medium. The network may be made up of single or multiple links.

network layer The third layer of the ISO open-systems interconnected reference model for data communications. It provides routing and relaying services associated with all of the layers of that station and is responsible for setting and resetting parameters and obtaining reports of error conditions.

normally closed contacts A set of contacts on a relay or switch that is closed when the switch or relay is in the de-energized state.

normally open contacts A set of contacts on a relay or switch that is open when the switch or relay is in the de-energized state.

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