{"schemaVersion":1,"slug":"station-double-point-indication-interface","name":"Station double-point indication interface","kind":"symbol","abbreviation":"SDII","aliases":["Substation automation and command interfaces","substations Substation automation and command interfaces","substations","Substations","Double-point device state","Mapped station position"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Carries the defined two-contact equipment position through the station point mapping.","description":["Carries the defined two-contact equipment position through the station point mapping. Station automation collects measurements and statuses and issues assigned commands through defined authority paths. A communicated point has a value, quality and equipment identity; it should not be treated as an unexplained contact.","In a substation control building, the station controller receives bay information and forwards an operator's selected command to the correct bay device. Device feedback confirms whether the intended result actually occurred. For this reference, the drawing identifies “Double-point device state” at the input and “Mapped station position” at the output. Intermediate and invalid states need preservation.","Document the point mapping, source, destination, command authority and failure behavior. A communication interface block explains information flow and does not certify network security or control-system availability. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Double-point device state. Identify its source device or document and the state represented on the drawing.","Follow the named output: Mapped station position. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Intermediate and invalid states need preservation.","Document the point mapping, source, destination, command authority and failure behavior. A communication interface block explains information flow and does not certify network security or control-system availability."],"drawingChecklist":["Label the source and connection reference for double-point device state.","Identify the destination and defined state of mapped station position.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Intermediate and invalid states need preservation."],"distinction":"Intermediate and invalid states need preservation. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Substations"},{"label":"Input / boundary","value":"Double-point device state"},{"label":"Output / connection","value":"Mapped station position"},{"label":"Lookup label","value":"SDII is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-station-automation","relevance":"Public technical context for substation automation and command interfaces. Station I/O, alarms, event recording, command and communications interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["ga-substation-rtu","plc-digital-input","station-alarm-timestamp-interface"],"artwork":"pi26-station-double-point-indication-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"station-automation","input":"Double-point device state","output":"Mapped station position"},"plainEnglish":{"title":"What this block does","introduction":"Carries the defined two-contact equipment position through the station point mapping.","example":"In a substation control building, the station controller receives bay information and forwards an operator's selected command to the correct bay device. Device feedback confirms whether the intended result actually occurred. For this reference, the drawing identifies “Double-point device state” at the input and “Mapped station position” at the output. Intermediate and invalid states need preservation.","drawings":"Start at the named input: Double-point device state. Identify its source device or document and the state represented on the drawing. Follow the named output: Mapped station position. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Double-point device state"},{"name":"Output","meaning":"Mapped station position"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Double-point device state","SDII","Mapped station position"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-2411 programmable automation controller","url":"https://selinc.com/products/2411/"}],"profileId":"power-installation-station-automation"},"url":"https://eloragrid.ai/symbols/station-double-point-indication-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/station-double-point-indication-interface.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-station-automation","publisher":"SEL","title":"SEL-2411 programmable automation controller","url":"https://selinc.com/products/2411/","scope":"Station I/O, alarms, event recording, command and communications interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for substation automation and command interfaces. Station I/O, alarms, event recording, command and communications interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}