{"schemaVersion":1,"slug":"microgrid-measurement-stale-data-supervisor","name":"Microgrid measurement stale-data supervisor","kind":"symbol","abbreviation":"MMSS","aliases":["Microgrid supervisory and communication interfaces","microgrids Microgrid supervisory and communication interfaces","microgrids","Microgrids","Measurement age and quality","Stale-data indication"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Marks the assigned power-system measurement invalid when its defined freshness condition is exceeded.","description":["Marks the assigned power-system measurement invalid when its defined freshness condition is exceeded. Microgrid supervision coordinates measurements, control authority and resource communication without replacing local protection. Each resource value needs a named measurement boundary, freshness condition and intended control use.","In a microgrid control room, the operator can see source availability, active constraints and current operating mode. A communication failure should remain distinguishable from an electrical resource failure. For this reference, the drawing identifies “Measurement age and quality” at the input and “Stale-data indication” at the output. The permitted age depends on the control use.","Identify signal ownership, quality flags, control priority and loss-of-data behavior. These functional references do not certify cyber security, closed-loop performance or equipment interoperability. 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: Measurement age and quality. Identify its source device or document and the state represented on the drawing.","Follow the named output: Stale-data indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The permitted age depends on the control use.","Identify signal ownership, quality flags, control priority and loss-of-data behavior. These functional references do not certify cyber security, closed-loop performance or equipment interoperability."],"drawingChecklist":["Label the source and connection reference for measurement age and quality.","Identify the destination and defined state of stale-data indication.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The permitted age depends on the control use."],"distinction":"The permitted age depends on the control use. 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":"Microgrids"},{"label":"Input / boundary","value":"Measurement age and quality"},{"label":"Output / connection","value":"Stale-data indication"},{"label":"Lookup label","value":"MMSS is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-power","relevance":"Public technical context for microgrid supervisory and communication interfaces. Active and reactive power, generation, load control, operating reserves and system supervision. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["microgrid-controller","sequence-of-events-recorder","microgrid-resource-command-acceptance-feedback"],"artwork":"pi26-microgrid-measurement-stale-data-supervisor","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-monitoring","input":"Measurement age and quality","output":"Stale-data indication"},"plainEnglish":{"title":"What this block does","introduction":"Marks the assigned power-system measurement invalid when its defined freshness condition is exceeded.","example":"In a microgrid control room, the operator can see source availability, active constraints and current operating mode. A communication failure should remain distinguishable from an electrical resource failure. For this reference, the drawing identifies “Measurement age and quality” at the input and “Stale-data indication” at the output. The permitted age depends on the control use.","drawings":"Start at the named input: Measurement age and quality. Identify its source device or document and the state represented on the drawing. Follow the named output: Stale-data indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Measurement age and quality"},{"name":"Output","meaning":"Stale-data indication"},{"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":["Measurement age and quality","MMSS","Stale-data indication"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid control systems","url":"https://selinc.com/services/microgrids-power-management/microgrid-control-systems/"}],"profileId":"power-installation-microgrid-monitoring"},"url":"https://eloragrid.ai/symbols/microgrid-measurement-stale-data-supervisor","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-measurement-stale-data-supervisor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-mg-power","publisher":"SEL","title":"Microgrid control systems","url":"https://selinc.com/services/microgrids-power-management/microgrid-control-systems/","scope":"Active and reactive power, generation, load control, operating reserves and system supervision.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid supervisory and communication interfaces. Active and reactive power, generation, load control, operating reserves and system supervision. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}