Using Node RED & MQTT with PLCnext Technology

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⌚Timestamps:
00:00 - Intro
00:43 - IoT Vs. IIoT
01:49 - Node-RED
03:49 - MQTT
04:53 - Node-RED and MQTT integration
07:11 - Conclusion

In this video, we’ll introduce you to the future of manufacturing made possible by the Industrial Internet of Things, or IIoT, and explore some of the tools that will work with and alongside it.

Unless you’ve been living under a rock, you’ve probably heard about the Internet of Things or IoT already. The IoT is not new. The IoT has been around for many years, but the term was not made popular until the early 2000s.

The first emerging IoT devices were consumer devices such as home thermostats and security systems.

So, what’s the difference between the IoT and the IIoT? The big difference is their applications. IoT devices are consumer-focused, while IIoT devices are industry-focused.

The IoT refers to a network of physical devices or “things” embedded with sensors, software, and other technologies to connect and exchange data with other devices and systems over the internet.

The IIoT is technically part of the IoT but specifically targets industrial applications. It connects machines, sensors, and systems using more robust and secure technologies to improve operational efficiency, safety, and reliability.

Let’s go back a few years and introduce you to Node-RED. Node-RED is a visual programming tool developed by IBM for IoT and designed to connect devices and online services.

Node-RED is a star player in the IoT world, facilitating the connection and automation of IoT devices.

What’s great about Node-RED is that it’s open-source and free for anybody to use.

It can be run on many cloud services, such as AWS, Microsoft Azure, and IBM Cloud.

With its visual interface, you can quickly build robust applications to automate and monitor your processes.

The Node-RED community has grown substantially, and numerous plugins have been developed to extend its functionality. The Node-RED library includes thousands of community-contributed nodes, continually expanding integration with increasing devices and services.

In Node-RED, users create flows by connecting nodes on a worksheet representing functions or devices, forming a visual representation of the workflow.

Node-RED comes loaded with many standard default nodes for your use.

Other nodes that interface with a PLC program can be added and consequently collect data from field devices.

For example, nodes can be added to interface with “PLCnext Technology”.

We use Node-RED to collect data from field devices connected to a PLC. How can we move this data via the Internet or a cloud-based database?

A very popular messaging protocol is Message Queuing Telemetry Transport, or MQTT. Its inherent characteristics make it ideal for IoT devices.

MQTT has two primary entities: the broker and the clients. The broker acts as a central hub directing communication between clients. Clients can be devices or applications that send or receive messages. MQTT operates on a publish/subscribe model.

An MQTT message consists of a topic and a payload. The payload carries the actual data, while the topic categorizes the message and determines which clients will receive it.

MQTT requires the use of a central Broker.

MQTT Brokers are available on the internet, including Mosquitto, HiveMQ, CloudMQTT, and many more.

So, if we combine Node-RED with MQTT, we get a dynamic team for IIoT solutions. We can set up a system in which sensors, controllers, and monitoring tools all communicate seamlessly.

‪@phoenixcontact1923‬

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IIoT Essentials: Node-RED & MQTT on PLCnext Technology: https://www.realpars.com/courses/node...

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