# Yard monitoring communications-fault interface

Canonical URL: https://eloragrid.ai/symbols/yard-monitoring-communications-fault-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: YMCI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchyards
Input: Monitor link health
Output: Condition-data communication fault

Reports loss of the selected equipment-monitoring communication path.

## In plain English

### What this block does

Reports loss of the selected equipment-monitoring communication path.

### A simple example

In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Monitor link health” at the input and “Condition-data communication fault” at the output. Protection and monitoring can use different paths.

### What the drawings help you do

Start at the named input: Monitor link health. Identify its source device or document and the state represented on the drawing. Follow the named output: Condition-data communication fault. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Monitor link health
- Output: Condition-data communication fault
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Monitor link health → YMCI → Condition-data communication fault
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm)


## What it represents

Reports loss of the selected equipment-monitoring communication path. Yard equipment supervision carries the condition and support-system information of primary equipment into station alarms. A monitor's declared alarm, measurement and self-fault output need separate point names.
In a switchyard marshalling kiosk, gas compartment, operating mechanism and cabinet-service indications are collected for the station controller. Their equipment tags identify the actual compartment or mechanism being monitored. For this reference, the drawing identifies “Monitor link health” at the input and “Condition-data communication fault” at the output. Protection and monitoring can use different paths.
Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life. 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: Monitor link health. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Condition-data communication fault. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Protection and monitoring can use different paths.
- Keep primary-device identity, compartment boundaries and monitor health visible. A monitoring illustration does not establish a leak rate, operating threshold or remaining equipment life.

## Information to show or reference

- Label the source and connection reference for monitor link health.
- Identify the destination and defined state of condition-data communication fault.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Protection and monitoring can use different paths.

## Important distinction

Protection and monitoring can use different paths. 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: Switchyards
- Input / boundary: Monitor link health
- Output / connection: Condition-data communication fault
- Lookup label: YMCI is a library lookup label, not a standard device designation.

## Public references

- [Modular switchgear monitoring](https://www.hitachienergy.com/in/en/products-and-solutions/high-voltage-switchgear-and-breakers/monitoring-and-controlled-switching/modular-switchgear-monitoring-msm) — Hitachi Energy. Public technical context for switchyard equipment condition interfaces. Gas, operating mechanism and circuit-breaker condition monitoring. 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.