# Microgrid resource-role assignment

Canonical URL: https://eloragrid.ai/symbols/microgrid-resource-role-assignment
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MRA
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Resource capability and topology
Output: Assigned resource roles

Assigns the selected resources to their documented grid-forming or following control roles.

## In plain English

### What this block does

Assigns the selected resources to their documented grid-forming or following control roles.

### A simple 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 “Resource capability and circuit arrangement” at the input and “Assigned resource roles” at the output. The controller cannot create unsupported equipment capability.

### What the drawings help you do

Start at the named input: Resource capability and circuit arrangement. Identify its source device or document and the state represented on the drawing. Follow the named output: Assigned resource roles. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Resource capability and topology
- Output: Assigned resource roles
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Resource capability and topology → MRA → Assigned resource roles
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Microgrid operating modes and transitions management](https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904)


## What it represents

Assigns the selected resources to their documented grid-forming or following control roles. 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 “Resource capability and topology” at the input and “Assigned resource roles” at the output. The controller cannot create unsupported equipment capability.
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.

## How to read it

- Start at the named input: Resource capability and topology. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Assigned resource roles. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The controller cannot create unsupported equipment capability.
- 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.

## Information to show or reference

- Label the source and connection reference for resource capability and topology.
- Identify the destination and defined state of assigned resource roles.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The controller cannot create unsupported equipment capability.

## Important distinction

The controller cannot create unsupported equipment capability. 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

- Representation: Functional block
- Installation focus: Microgrids
- Input / boundary: Resource capability and topology
- Output / connection: Assigned resource roles
- Lookup label: MRA is a library lookup label, not a standard device designation.

## Public references

- [Microgrid operating modes and transitions management](https://productinfo.se.com/emol_functional_specifications/doca0371_emol_functionalspecifications/EN/DOCA0371_EMOL_Functional_Specifications_DD00894746.xml/%24/EMOL_OperatingModesandTransitionsManagement_DD00895904) — Schneider Electric. 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.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.