Tag Archives: node-red tutorial

Node-RED Modbus TCP Handling Errors


Node-RED Modbus TCP can recover from communication errors automatically. Options are available to you the programmer to continue the Node-RED flow upon detection of these errors.

Broken Ethernet cable, Modbus Server power, and Node-RED Client offline are just a few of the errors that can occur on the industrial plant floor. Our Node-RED program must account for and be tested for each of these conditions.
We will be communicating Modbus TCP (Ethernet) to our Click Plus PLC. Using the catch node we will detect and display errors that may occur. Let’s get started. Continue Reading!

Install Node-RED on Raspberry Pi 4


We will now be installing Node-RED on a Raspberry Pi 4 single-board computer. A static IP address will also be given for both the WiFi and Ethernet connections.
Install Node-RED on Raspberry Pi 4
The Raspberry Pi has quickly become a fixture in the industrial environment when utilizing the internet of things. (IoT) We will be utilizing this low-cost computer to poll and log information from our PLCs using Modbus and MQTT protocols. Node-RED will be the IoT enabling software that will allow us to utilize this hardware.
https://accautomation.ca/series/node-red-iot-enabling-software/
Let’s get started with installing Node-RED and setting up a fixed IP address on our Raspberry Pi 4 computer. Continue Reading!

Do-More PLC Node-RED HTTP Request


Node-RED HTTP Request can be used to read any BRX Do-More PLC memory area. This HTTP (Hypertext Transfer Protocol) communication will only read information from our controller.
Do-More PLC Node-RED HTTP Request
The BRX Do-More REST API is used to read information using a URL (Uniform Resource Locator) or web address. We will be using the HTTP request node in Node-RED to read information from our BRX Do-More REST API-enabled controller. Writing using Modbus will also be shown. This will all be done on our Raspberry Pi 4 single-board computer. Let’s get started. Continue Reading!

Node-RED SQL Database Spreadsheet Connection


We will now look at the connection to our SQL database using a spreadsheet application. Previously we used Node-RED to communicate Modbus TCP and RTU to our Click PLC and Solo Temperature Controller. The information collected from the controllers was then put into an SQLite SQL database.
Node-RED SQL Database Spreadsheet Connection
Spreadsheets like Excel are great for analysis of the data. We will be connecting to our SQLite SQL database with WPS spreadsheets. This will be accomplished by using an ODBC driver as the translator between the database and spreadsheet. Let’s get started. Continue Reading!

Node-RED SQL Database Log – Modbus Logging


Node-RED can easily log data to a database. SQL (Structured Query Language) can be used to communicate to a SQL database. Databases separate analysis from the data unlike spreadsheets like Excel. The database is designed to hold more information than spreadsheets and allow multiple users to access the information.
Node-RED SQL Database Log - Modbus Logging
We will be creating an SQLite SQL database. SQLite Studio will be used to design the structure of the database. (Tables) Installing the node-red-sqlite-node palette will allow us to log the information from our Solo process temperature controller, Click PLC, and dashboard variables. Let’s get started. Continue Reading!