# Microgrid control-mode event recorder

Canonical URL: https://eloragrid.ai/symbols/microgrid-control-mode-event-recorder
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MCER
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Control authority events
Output: Mode and authority history

Associates changes in control authority or mode with their recorded causes and times.

## In plain English

### What this block does

Associates changes in control authority or mode with their recorded causes and times.

### 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 “Control authority events” at the input and “Mode and authority history” at the output. Event timing quality needs retention.

### What the drawings help you do

Start at the named input: Control authority events. Identify its source device or document and the state represented on the drawing. Follow the named output: Mode and authority history. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Control authority events
- Output: Mode and authority history
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Control authority events → MCER → Mode and authority history
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

Associates changes in control authority or mode with their recorded causes and times. 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 “Control authority events” at the input and “Mode and authority history” at the output. Event timing quality needs retention.
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: Control authority events. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Mode and authority history. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Event timing quality needs retention.
- 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 control authority events.
- Identify the destination and defined state of mode and authority history.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Event timing quality needs retention.

## Important distinction

Event timing quality needs retention. 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: Control authority events
- Output / connection: Mode and authority history
- Lookup label: MCER 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.