300+ SCADA Protocol Articles & Guides
Deep dives on Modbus, DNP3, IEC 60870-5-101/104, IEC 61850, OPC UA, Profinet, MQTT, IEC 62443, and substation automation — written for practicing engineers.
How to Configure DNP3 Communication Between Master and Outstation
Learn how to configure DNP3 master and outstation communication step by step. Covers addressing, polling, unsolicited responses, TCP/IP setup, and security.
How to Configure Modbus RTU Over RS-485: Step-by-Step
Modbus RTU over RS-485 configured step by step: bus wiring and topology, termination and biasing, addressing, register types, and T1.5 and T3.5 timing.
Modbus TCP/IP Setup: Step-by-Step Configuration Guide
Modbus TCP/IP setup from scratch: IP planning, server and client configuration, MBAP header basics, gateway bridging to RTU, and connection troubleshooting.
Industrial Cybersecurity: Complete Guide to OT & ICS Security
Learn how industrial cybersecurity protects factories, power grids & critical infrastructure. Covers IEC 62443, OT security, threats & implementation steps.
IEC 62443 Explained: A Practical Guide to Industrial Cybersecurity Standards
What is IEC 62443? A plain-language guide covering all parts, the 7 foundational requirements, security levels, zones
OPC UA Client-Server Architecture Explained: Sessions, Services, and Subscriptions
How the OPC UA client-server architecture works: discovery, Secure Channels, sessions, subscriptions, service sets, and real-world deployment patterns.
How to Connect a PLC to OPC UA: Full Setup Guide
Connect a PLC to OPC UA three ways: built-in server, gateway software, or hardware bridge. Setup for Siemens, Allen-Bradley, Beckhoff, and Schneider PLCs.
OPC Classic vs OPC UA: Key Differences and Migration Guide
OPC Classic vs OPC UA: compare security, platform support, and data modeling. Plus a practical migration guide with three strategies to fit any situation.
OPC UA vs MQTT vs Modbus: Which Protocol Should You Use?
OPC UA vs MQTT vs Modbus: Which protocol fits your project? Compare security, speed, data modeling, and scalability to pick the right one for your IIoT system.
OPC UA Companion Specifications Explained: 60+ Industry Standards in One Guide
What are OPC UA companion specifications? Explore 60+ standardized data models for robotics, packaging, machine tools, and more. Practical guide included.
What Is OPC UA? A Complete Beginner's Guide
What is OPC UA? Learn how this industrial communication standard works, why it matters for Industry 4.0, and how to get started. A plain language guide.
Coding Modbus TCP/IP for Arduino: A Complete Technical Guide
Complete guide to coding Modbus TCP/IP on Arduino. Learn protocol structure, implement client/server, practical examples, troubleshooting. Perfect for industrial automation projects.
What is PROFINET? Complete Guide for Engineers
What is PROFINET? This complete guide explains how PROFINET works — IO-Controller/IO-Device model, RT classes, IRT, conformance classes, GSDML files, MRP redundancy, PROFIsafe, and how it differs from PROFIBUS. Based on IEC 61784-2.
PROFIBUS Cable: Types, Specs & Wiring Guide
Everything engineers need to know about PROFIBUS cable — types A/B/C/D, impedance, wire gauge, jacket colors, baud rate vs. cable length, DB9 and M12 connector pin assignments, termination, shielding, grounding, and troubleshooting. Based on IEC 61158-2 and IEC 61784-1.
PROFIBUS Troubleshooting: Complete Engineer's Guide
"The definitive PROFIBUS troubleshooting guide for engineers — covering physical layer faults, termination failures, address conflicts, diagnostic bytes decoded, EMC problems, PA segment faults, and how to use protocol analyzers. Systematic fault-finding from first principles.
PROFIBUS vs Modbus: Complete Technical Comparison for Engineers
A thorough technical comparison of PROFIBUS vs Modbus — covering protocol architecture, message framing, function codes, CRC methods, speed, diagnostics, network topology, and when to choose each. Based on the original Modicon Modbus specification and IEC 61784-1.
PROFIsafe Protocol: How It Works & SIL Ratings
A complete technical guide to PROFIsafe — covering the black channel principle, Safety PDU structure, CRC mechanisms, MonitoringNumber, F-Parameters, Status/Control Byte decoded, SIL/PL ratings, F-Host and F-Device architecture, and IEC 61784-3-3. Written for automation and safety engineers.
What Is PROFIBUS? Complete Beginner's Guide
What is PROFIBUS? This beginner's guide explains what PROFIBUS is, how it works, the difference between PROFIBUS DP and PA, where it's used, and why it still matters — in plain language with no assumed knowledge.