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+# machineGroupControl (MGC)
+
+Custom Node-RED node for coordinating multiple rotatingMachine children as a managed group.
+
+## Overview
+
+| Property | Value |
+|----------|-------|
+| **Version** | 0.9.0 |
+| **Category** | Group Control |
+| **Inputs** | 1 |
+| **Outputs** | 3 (process / dbase / parent) |
+| **Part of** | [EVOLV](https://gitea.wbd-rd.nl/RnD/EVOLV) |
+
+## Purpose
+
+The `machineGroupControl` (MGC) node acts as a parent coordinator for multiple `rotatingMachine` child nodes. It provides:
+
+- **Group coordination** of machine start/stop sequences
+- **Position awareness** with configurable distance from parent
+- **Centralized state** aggregation of all child machines
+- **Logging** and telemetry for the group as a whole
+
+## Configuration
+
+| Field | Description | Default |
+|-------|-------------|---------|
+| `enableLog` | Enable node logging | false |
+| `logLevel` | Log verbosity level | - |
+| `positionVsParent` | Position relative to parent node | - |
+| `positionIcon` | Icon displayed in editor | - |
+| `hasDistance` | Whether distance is relevant | false |
+| `distance` | Distance from parent | - |
+| `distanceUnit` | Unit for distance | - |
+
+## Child Nodes
+
+Manages **[rotatingMachine](https://gitea.wbd-rd.nl/RnD/rotatingMachine)** children. Machines register via Port 2 messages.
+
+## Inputs and Outputs
+
+### Input (Port 0)
+Group-level commands and setpoints.
+
+### Output Port 0 - Process Data
+Aggregated group state (running count, total flow/power).
+
+### Output Port 1 - InfluxDB Telemetry
+Group-level time-series data.
+
+### Output Port 2 - Parent Communication
+Registration and status messages to upstream nodes.
+
+## Dependencies
+
+- [generalFunctions](https://gitea.wbd-rd.nl/RnD/generalFunctions) (MenuManager, configManager)
+
+## Technical Requirements
+
+- Node.js >= 18
+- Node-RED >= 3.x
+- One or more `rotatingMachine` child nodes
+
+## Testing
+
+```bash
+node --test test/basic/*.test.js
+node --test test/integration/*.test.js
+node --test test/edge/*.test.js
+```