Topic hub

Industrial Networks

The protocols that connect a plant: Modbus RTU and TCP, PROFINET and PROFIBUS, EtherNet/IP, EtherCAT, IO-Link and OPC UA, plus the wiring, addressing and diagnostics each one needs.

Most industrial protocol problems are not protocol problems. They are addressing, cabling, or a device that dropped off the network and never came back. These guides cover how each protocol actually frames its data, how to plan the addressing, and what to look at first when a station goes red.

6 articles in this hub

Flat vector diagram of an IO-Link master connecting four sensors to a PLC over PROFINET, showing process data flow on each sensor cable
io-linkindustrial protocolsplc sensors

IO-Link Explained: How It Works with Your PLC

IO-Link turns a standard sensor cable into a two-way digital channel. This guide explains how the protocol works, how masters connect to your PLC, and what you actually gain on the plant floor.

Jul 22, 2026 路 9 min read

Flat vector diagram of OPC UA protocol architecture connecting a PLC to SCADA, historian and cloud clients through a central OPC UA server block
opc uaindustrial protocolsscada

OPC UA Protocol Explained for PLC Engineers

OPC UA is the industrial protocol linking PLCs to SCADA, historians and cloud systems. Learn how nodes, sessions, security and subscriptions actually work in plain terms.

Jul 22, 2026 路 10 min read

PROFINET IO Controller Device network diagram showing cyclic data flow and Application Relations
profinettia portalindustrial ethernet

PROFINET IO: Controller, Device and AR Explained

PROFINET IO splits the network into Controllers, Devices and Supervisors. Learn how AR and CR objects work, cycle times, and how to configure them in TIA Portal.

Jul 10, 2026 路 9 min read

EtherNet/IP scanner and adapter topology diagram showing CIP Class 1 and Class 3 connections
ethernet/ipciprockwell

EtherNet/IP Scanner vs Adapter: How It Works

EtherNet/IP scanner and adapter roles explained: CIP connections, I/O vs explicit messaging, assembly objects, RPI, and step-by-step commissioning for Logix PLCs.

Jul 9, 2026 路 8 min read

PROFINET wiring diagram showing cable types, RJ45 and M12 connectors, and network topology with PLC and IO devices
profinetindustrial ethernetwiring

PROFINET Wiring: Cables, Connectors and Topology

PROFINET wiring trips up even experienced engineers. This guide covers cable types, RJ45 vs M12 connectors, pinouts, bend radii, topology rules and common mistakes.

Jul 9, 2026 路 8 min read

Modbus RTU RS-485 network diagram showing PLC master and multiple slave devices on a two-wire bus
modbus rturs-485serial protocols

Modbus RTU Protocol Explained: Frames, Timing and Wiring

Modbus RTU over RS-485 is still the most common industrial serial protocol. Learn exactly how frames are built, how timing works, and how to wire it right the first time.

Jun 27, 2026 路 8 min read