{"schemaVersion":1,"slug":"microgrid-operating-mode-history-recorder","name":"Microgrid operating-mode history recorder","kind":"symbol","abbreviation":"MOHR","aliases":["Microgrid operating-mode controls","microgrids Microgrid operating-mode controls","microgrids","Microgrids","Mode events and causes","Operating-mode history"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Associates confirmed mode changes with their initiating cause and recorded time.","description":["Associates confirmed mode changes with their initiating cause and recorded time. A microgrid operating-mode function coordinates how local sources and loads relate to the utility connection. The selected mode, the measured electrical condition and the actual switching configuration can differ during a transition.","In a microgrid serving a switchroom and industrial loads, the controller can move between grid-connected and islanded operating states only through its defined transition logic. Each state needs identifiable source roles and feedback. For this reference, the drawing identifies “Mode events and causes” at the input and “Operating-mode history” at the output. Clock quality affects event interpretation.","Show the requested mode, entry conditions, completion feedback and failure indication. These functional blocks explain control responsibilities and do not specify a ready-to-use operating sequence or grid-connection approval. 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: Mode events and causes. Identify its source device or document and the state represented on the drawing.","Follow the named output: Operating-mode history. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Clock quality affects event interpretation.","Show the requested mode, entry conditions, completion feedback and failure indication. These functional blocks explain control responsibilities and do not specify a ready-to-use operating sequence or grid-connection approval."],"drawingChecklist":["Label the source and connection reference for mode events and causes.","Identify the destination and defined state of operating-mode history.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Clock quality affects event interpretation."],"distinction":"Clock quality affects event interpretation. 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":"Mode events and causes"},{"label":"Output / connection","value":"Operating-mode history"},{"label":"Lookup label","value":"MOHR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-modes","relevance":"Public technical context for microgrid operating-mode controls. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["microgrid-controller","grid-forming-inverter","microgrid-emergency-operating-state-interface"],"artwork":"pi26-microgrid-operating-mode-history-recorder","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-modes","input":"Mode events and causes","output":"Operating-mode history"},"plainEnglish":{"title":"What this block does","introduction":"Associates confirmed mode changes with their initiating cause and recorded time.","example":"In a microgrid serving a switchroom and industrial loads, the controller can move between grid-connected and islanded operating states only through its defined transition logic. Each state needs identifiable source roles and feedback. For this reference, the drawing identifies “Mode events and causes” at the input and “Operating-mode history” at the output. Clock quality affects event interpretation.","drawings":"Start at the named input: Mode events and causes. Identify its source device or document and the state represented on the drawing. Follow the named output: Operating-mode history. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Mode events and causes"},{"name":"Output","meaning":"Operating-mode history"},{"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":["Mode events and causes","MOHR","Operating-mode history"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904"}],"profileId":"power-installation-microgrid-modes"},"url":"https://eloragrid.ai/symbols/microgrid-operating-mode-history-recorder","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-operating-mode-history-recorder.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-modes","publisher":"Schneider Electric","title":"Microgrid operating modes and transitions management","url":"https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904","scope":"Grid-connected and island modes, transitions, topology and authority.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid operating-mode controls. Grid-connected and island modes, transitions, topology and authority. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}