Productivity PLC Node-RED MQTT – P1000 / P2000

Productivity PLC Node-RED MQTT - P1000 / P2000

We will use an MQTT broker in Node-RED to communicate to the productivity PLC clients. MQTT stands for Message Queuing Telemetry Transport. This simple ‘publish and subscribe’ communication protocol does not take too many resources. Constrained devices with low bandwidth are ideal for MQTT. This protocol provides machine-to-machine (M2M) connectivity, perfect for the Internet of … Read more

PLC Learning Series – HMI – Interfacing

PLC Learning Series – HMI

A human-machine interface (HMI) is present in some form for every PLC. The HMI connects a user to a machine system to exchange information or control data. This interaction with the system can be through hardware or software. HMIs offer different people information and control in many ways for the automated system. Operators, supervisors, mechanics, … Read more

Solo SL-SOFT Installation – Temperature Controller Software

Solo SL-SOFT Installation - Temperature Controller Configuration and Monitoring Software

All Solo Standard Process Temperature Controllers that support RS-485 serial communications can use the SL-SOFT configuration and monitoring software. This free package will communicate to monitor multiple SOLO controllers using Modbus RTU or Modbus ASCII protocols. We will be installing the SL-SOFT configuration and monitoring software package on our Windows 10 PC. Communicating through our … Read more

Raspberry Pi Serial Port Programming

Raspberry Pi Serial Port Programming

Node-RED will be used on the Raspberry Pi 4 to communicate serial Modbus RTU to a Solo process temperature controller and Click PLC using twisted pair RS485. This will be done on the same serial network so the devices will be daisy-chained together on the two wires. We will be reading the PV (present value) … Read more

Node-RED Modbus TCP Handling Errors

Node-RED Modbus TCP Handling Communication 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 … Read more

Waveshare USB to Serial PC Installation

Waveshare WS USB RS485 PC Installation

We will be installing an industrial USB to RS485 converter on our computer. The Waveshare USB to serial port is a 2-wire USB to RS-485 serial communication adapter for RS485 use. It does not require an external power supply or complicated configuration. It has a Type A (plug) USB connector for the computer side and … Read more