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Merge pull request #988 from flowforge/zj-docs-filter
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ZJvandeWeg authored Jul 20, 2023
2 parents c71cc06 + 509e4b1 commit b708815
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---
title: "Nodes explained: Filter"
subtitle: The filter node is incredibly versatile, let's go over some use-cases
description: Forwarding or blocking messages based on values, change of them, or lack of change.
date: 2023-06-16
authors: ["zeger-jan-van-de-weg"]
image:
tags:
- posts
- how-to
---

The Filter node, previously called "Report by Exception", has two modes of
## What's the Filter node in Node-RED used for?

The Filter node, previously called "Report by Exception" (RBE), has two modes of
operation, called deadband and narrowband. These modes allow users to limit network
traffic, write operations to historians, or limit reporting of values outside
a range that is worth reporting on. It's very versatile, once you fully understand the
node.

<!--more-->

The Filter node is part of the core nodes in Node-RED, meaning it is installed
by default.

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1 change: 1 addition & 0 deletions src/redirect.md
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Expand Up @@ -28,6 +28,7 @@ redirects:
- { "from": "/blog/2023/06/Flowforge-as-a-No-Code-Ethernet_IP-to-Profinet-Protocol-Converter/", "to": "/blog/2023/06/Node-RED-as-a-No-Code-Ethernet_IP-to-S7-Protocol-Converter/" }
- { "from": "/docs/user/devices/", "to": "/docs/device-agent/introduction" }
- { "from": "/blog/2023/06/node-explained-split/", "to": "/node-red/core-nodes/split/"}
- { "from": "/blog/2023/07/node-explained-filter/", "to": "/node-red/core-nodes/rbe/"}
# The "permalink" attribute determines where the output page will be located.
permalink: "{{ redirect.from }}"
# The "redirect" layout just has a small html header with the meta tags that do redirection.
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