PLC Networking

Wiring PLCs to each other and to the wider plant: Modbus TCP, PROFINET, EtherNet/IP, S7 comms, gateways and routing.

Connect Two PLCs Over Modbus TCP: A Practical Guide

Two PLCs, one switch, no SCADA in the middle. A complete walkthrough: register map, server and client configuration, laptop verification, watchdog and…

21 Jul 2026
Read article: Connect Two PLCs Over Modbus TCP: A Practical Guide

About this site

This is the dedicated blog of Unified Automation

Unified Automation SRL is an independent automation engineering company based in Timisoara, Romania. We program, integrate and maintain the control systems that keep production running — PLC, SCADA, MES and robotics. This site carries the technical writing; everything about services, projects and contact lives on the main site.

Go to unified-automation.net →

The Blog

Field notes, teardowns and step-by-step guides from real commissioning work. Written on the shop floor, not in a brochure.

WE LOVE AUTOMATION

Topics

PLC & Networking
Protocols
Edge Computing
SCADA & HMI
Data & Analytics
Lab Notes

The Company

Main website
Services
Projects
Contact

SIEMENS TIA PORTAL·OMRON SYSMAC·BECKHOFF TWINCAT·WAGO·CODESYS·MODBUS TCP·OPC UA·MQTT SPARKPLUG B·NODE-RED·GRAFANA·INFLUXDB· SIEMENS TIA PORTAL·OMRON SYSMAC·BECKHOFF TWINCAT·WAGO·CODESYS·MODBUS TCP·OPC UA·MQTT SPARKPLUG B·NODE-RED·GRAFANA·INFLUXDB·

Unified Automation Blog — the knowledge base of Unified Automation SRL, Timisoara, Romania.

PLC Networking

Connect Two PLCs Over Modbus TCP: A Practical Guide