{"schemaVersion":1,"slug":"plc-digital-input","name":"PLC digital input","kind":"symbol","abbreviation":"DI","aliases":[],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"A PLC digital input reads a documented discrete electrical state from field wiring.","description":["A PLC digital input reads a documented discrete electrical state from field wiring. The schematic identifies input channel, signal common and field supply as required by the chosen module."],"readingNotes":["Check whether the input expects sourcing or sinking field wiring.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Identify channel address","Show input common/supply","Reference field signal polarity"],"distinction":"A digital input reads a state; it does not provide the power output used to drive an actuator.","facts":[{"label":"Drawing role","value":"Controller interface"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"pub-symbol-digital-io","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["plc-io","terminal"],"artwork":"edu-plc-digital-input","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/plc-digital-input","illustration":{"url":"https://eloragrid.ai/library/illustrations/plc-digital-input.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-digital-io","title":"Modicon TM3 digital I/O hardware guide","publisher":"Schneider Electric","url":"https://www.se.com/ca/en/download/document/EIO0000003125/","type":"manufacturer","scope":"Public manufacturer explanation of the equipment function and selection context.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}