# Microgrid standby-controller ownership interface

Canonical URL: https://eloragrid.ai/symbols/microgrid-standby-controller-ownership-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MSOI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Controller availability and authority
Output: Selected supervisory controller

Identifies the documented transfer of supervisory ownership between controller instances.

## In plain English

### What this block does

Identifies the documented transfer of supervisory ownership between controller instances.

### A simple 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 “Controller availability and authority” at the input and “Selected supervisory controller” at the output. Redundancy depends on the complete architecture.

### What the drawings help you do

Start at the named input: Controller availability and authority. Identify its source device or document and the state represented on the drawing. Follow the named output: Selected supervisory controller. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Controller availability and authority
- Output: Selected supervisory controller
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Controller availability and authority → MSOI → Selected supervisory controller
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/)


## What it represents

Identifies the documented transfer of supervisory ownership between controller instances. 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 “Controller availability and authority” at the input and “Selected supervisory controller” at the output. Redundancy depends on the complete architecture.
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.

## How to read it

- Start at the named input: Controller availability and authority. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Selected supervisory controller. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Redundancy depends on the complete architecture.
- 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.

## Information to show or reference

- Label the source and connection reference for controller availability and authority.
- Identify the destination and defined state of selected supervisory controller.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Redundancy depends on the complete architecture.

## Important distinction

Redundancy depends on the complete architecture. 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: Controller availability and authority
- Output / connection: Selected supervisory controller
- Lookup label: MSOI is a library lookup label, not a standard device designation.

## Public references

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/) — SEL. 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.

## 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.