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ECT281 Robotic Terms

TermDefinition
Coil Output device that, when energized, opens associated normally closed contacts and close is normally open contacts.
Relay Logic Diagram Graphic diagram that shows the logical relationship between hardwired electrical devices.
Ladder Diagram The program loaded into the programmable logic controller.
Rails Two vertical lines labeled L1 and L2 that connect the rungs of a relay logic or PLC diagram.
Rung Horizontal line in a relay logic diagram that has input devices and an output device.
Branch A horizontal line in parallel with part of a rung that shows a parallel current path.
Normally Closed Contact A switching device that is normally in a closed state (short circuit) when its corresponding coil is D energized, and opens when the coil is energized.
Normally Open Contact Switching device that is normally in an open state (open circuit) when its corresponding coil is de-energized and closes to make a current path when the coil is energized.
Relay An electromechanical device that uses a current flow to produce a magnetic field to move an electrically conductive armature.
Solenoid An electromechanical device that uses a current flow to produce a magnetic field to move ferrite metal core and produce physical motion.
Pull-in Current The minimum amount of coil current needed to actuate or energize a solenoid or relay from its normal deenergized position.
Drop-out Current The maximum coil current below which an energized relay will return to its normal state.
Seal-in A feedback loop where a relay coil holds itself energized to a contact placed in parallel to the start switch.
Interlock A contact used by one relay to prevent another coil from being energized.
Created by: NicholeBarber
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