---
title: Reason Code Assignment
slug: reason-code-assignment
createdAt: 2026-05-04T09:02:47.091Z
---

The Reason Code Assignment page in Mantsu's Downtimes Manager **links a reason tree (or a selected subset of it) to a specific Equipment or Equipment Class**. This assignment determines exactly which reason codes are available to an operator when they register a downtime event on a given machine.

## Flexibility

Engineers have full flexibility:

- Assign the **entire tree**, or
- **Cherry-pick** specific branches and leaf nodes to attach

This prevents operators from seeing irrelevant codes and keeps classification fast and accurate.

:::hint{type="warning"}
Only equipment where Downtimes is enabled will be available for reason tree assignment.
:::

## Short Stops

**Short stops** are stops that last only a few seconds to a minute, they happen too frequently for an operator to log separately. Left unconfigured, they inflate the number of uncategorized downtime events and distort OEE Availability figures.

The **Short Stop configuration** solves this by defining:

- A **duration threshold**
- A **catch-all reason code**

Any downtime event that is equal to or shorter than the threshold is automatically classified under the designated Short Stop reason code **without any operator interaction**.

:::hint{type="info"}
**Example**

- **Short Stop Duration:** 10 seconds 
- **Short Stop Reason:** Maintenance and Cleaning

➡ All downtimes of 10 seconds or less will automatically be classified as **Maintenance and Cleaning**.
:::