{"schemaVersion":1,"slug":"plc-io","name":"PLC input / output","kind":"symbol","abbreviation":"PLC I/O","aliases":["PLC input","PLC output","digital input","digital output","analogue input","analog output","controller IO","PLCIOI1T","PLCIOO1T"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","IEEE / ANSI"],"summary":"A controller interface point connecting field signals to an identified module channel.","description":["A PLC input or output point connects a field signal with a controller module and channel. Input and output, digital and analogue, and one-wire or multi-wire arrangements are distinct characteristics. The module specification establishes electrical behaviour and terminal information.","A schematic should connect channel identification to the I/O schedule and field device. Shared supplies, commons and isolation boundaries require their own documentation. A generic controller box is not a pinout or wiring instruction for a particular module."],"readingNotes":["Identify module, channel and signal direction.","Use the selected module documentation to interpret supply, common and terminal requirements."],"drawingChecklist":["Match the I/O schedule.","Identify signal type and channel reference.","Link module terminals and field-device documentation."],"distinction":"An input point, output point and communications connection are different interfaces. A generic box cannot establish their electrical compatibility.","facts":[{"label":"Channel identity","value":"Controller, module and point"},{"label":"Signal characteristics","value":"Selected module specification"},{"label":"Interface direction","value":"Input or output"},{"label":"Public Autodesk reference names","value":"PLCIOI1T, PLCIOO1T (vendor identifiers, not IEC symbol IDs)"}],"references":[{"sourceId":"autodesk-plc","relevance":"Public input/output point and wiring-count categories."}],"related":["terminal","indicator-lamp","selector-switch","control-cabinet"],"artwork":"plc","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/plc-io","illustration":{"url":"https://eloragrid.ai/library/illustrations/plc-io.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-plc","title":"PLC input and output point symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-16A484BE-F73C-4612-8D12-E760E981C4E9.htm","type":"cad-reference","scope":"Input/output point and wiring-count variants. Electrical module specifications are manufacturer-specific.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public input/output point and wiring-count categories."}]}