{"schemaVersion":1,"slug":"iec-two-wire-plc-point-in-1st-point-2-wires","name":"IEC two-wire PLC point: in, 1st point, 2 wires","kind":"symbol","abbreviation":"PLC","aliases":["PLCIOI2T","PLCIOI2TV","two-wire PLC point IN, 1st Point, 2 Wires"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"Two-wire PLC point form: IN, 1st Point, 2 Wires.","description":["A two-wire PLC point form shows two terminal connections associated with a controller input or output point. The symbol is an interface reference, and the module data must establish whether the connection is digital, analogue, isolated or part of a shared common group. This entry identifies the in, 1st point, 2 wires form in the publisher's IEC-context family.","When tracing a field device to a PLC terminal strip, identify the rack, module, channel and both terminal numbers. Follow the common or return conductor as carefully as the signal conductor so a technician can reconcile the schematic with the module wiring sheet. The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.","Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline."],"readingNotes":["The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.","Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline."],"drawingChecklist":["Identify controller, module and channel address.","Label both terminals and the shared common where used.","Reference signal type, polarity and module wiring documentation."],"distinction":"This entry adds the in, 1st point, 2 wires detail to the broader two-wire PLC point family. Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.","facts":[{"label":"Drawing form","value":"IN, 1st Point, 2 Wires"},{"label":"Public vendor block names","value":"PLCIOI2T / PLCIOI2TV. Autodesk identifiers, not standards database IDs."},{"label":"Drawing purpose","value":"two-wire PLC point"},{"label":"Graphic scope","value":"Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint."}],"references":[{"sourceId":"autodesk-plc","relevance":"Public PLC I/O table explicitly lists PLCIOI2T / PLCIOI2TV with this operating or connection form. Vendor graphics are linked, not copied."}],"related":["plc-digital-input","plc-transistor-output","plc-analog-input"],"artwork":"s28-iec-two-wire-plc-point-in-1st-point-2-wires","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"IN, 1st Point, 2 Wires","reference":"Autodesk IEC-60617 Symbol Preview: PLC I/O, PLCIOI2T / PLCIOI2TV. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted."},"plainEnglish":{"title":"What does IEC two-wire PLC point: in, 1st point, 2 wires mean?","introduction":"A two-wire PLC point form shows two terminal connections associated with a controller input or output point. The symbol is an interface reference, and the module data must establish whether the connection is digital, analogue, isolated or part of a shared common group. This entry identifies the in, 1st point, 2 wires form in the publisher's IEC-context family.","example":"When tracing a field device to a PLC terminal strip, identify the rack, module, channel and both terminal numbers. Follow the common or return conductor as carefully as the signal conductor so a technician can reconcile the schematic with the module wiring sheet. The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.","drawings":"Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"PLC input and output point symbols","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-16A484BE-F73C-4612-8D12-E760E981C4E9.htm"}],"detail":"Two-wire PLC point form: IN, 1st Point, 2 Wires. This entry adds the in, 1st point, 2 wires detail to the broader two-wire PLC point family. Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-two-wire-plc-point-in-1st-point-2-wires","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-two-wire-plc-point-in-1st-point-2-wires.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 PLC I/O table explicitly lists PLCIOI2T / PLCIOI2TV with this operating or connection form. Vendor graphics are linked, not copied."}]}