ladder diagram rung

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• Ladder logic — is a philosophy of drawing electrical logic schematics. It is now a graphical language very popular for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the… …   Wikipedia

• Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

• Programmable logic controller — A programmable logic controller (PLC) or programmable controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. PLCs are used in many different industries and machines… …   Wikipedia

• Juggling notation — It has often been said, of many juggling patterns, that it is easier done than said , while it might be easy to learn a given manoeuvre and demonstrate it for others, it is often much harder to communicate the idea accurately using speech or… …   Wikipedia

• Relay logic — is a method of controlling industrial electronic circuits by using relays and contacts. ladder logic The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series… …   Wikipedia

• chemical bonding — ▪ chemistry Introduction       any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …   Universalium

• Observational cosmology — Physical cosmology Universe · Big Bang …   Wikipedia

• Hyades (star cluster) — Hyades Cluster Observation data (J2000.0 epoch) Constellation …   Wikipedia

• Mexico City Metropolitan Cathedral — Metropolitan Cathedral of the Assumption of Mary Catedral Metropolitana de la Asunción de María (Spanish) Mexico City Cathedral, with the Metropolitan Tabernacle to the right. Basic in …   Wikipedia

• Alpha Persei Cluster — Observation data (2000.0 epoch) Constellation Perseus …   Wikipedia

• Coma Star Cluster — Melotte 111, taken from a rural location in Derbyshire, England, in March 2003. Observation data (J2000 epoch) Constellation …   Wikipedia