Blog Archive: May 2026
69 articles published in May 2026.
Everything Voltrus published in May 2026 — "Voltrus PLC v1.0 — The First Native macOS PLC IDE Ships Today", "BACnet vs Modbus for Building Automation (2026): Protocol Comparison", "EtherNet/IP and CIP Protocol Explained (2026): Complete Guide". Practical guides and comparisons for engineers working with industrial automation tools, from protocol explorers to SCADA and HMI.
Voltrus PLC v1.0 — The First Native macOS PLC IDE Ships Today
Voltrus PLC v1.0 is available now: IEC 61131-3 Structured Text editor, built-in softPLC runtime, AI-assisted programming, and multi-driver I/O (Modbus, OPC-UA, S7, EtherNet/IP, MQTT).
Read articleBACnet vs Modbus for Building Automation (2026): Protocol Comparison
BACnet vs Modbus for building automation. Compare data models, discovery, scalability, and HVAC integration. When to use each protocol and how to test on macOS.
Read articleEtherNet/IP and CIP Protocol Explained (2026): Complete Guide
EtherNet/IP and CIP protocol explained. Understand explicit vs implicit messaging, CIP data types, Allen-Bradley tag addressing, and how EtherNet/IP compares to Modbus TCP and OPC UA.
Read articleBest Modbus Simulator in 2026: Free and Paid Tools Compared
Need to test Modbus devices without hardware? Compare 7 Modbus simulators: Modbus Poll, Modbus Slave, diagslave, and more. Covers macOS, Windows, Linux. Free download links included.
Read articleModbus Poll Tool: How to Read and Write Registers on macOS (2026)
A complete guide to Modbus poll tools: what they do, how they work, function codes FC01-FC06, and how to read/write Modbus registers on macOS with a native poll tool. TCP + RTU support.
Read articleModbus RTU Troubleshooting Guide: CRC Errors, Timeouts, and Wiring
Fix Modbus RTU communication errors. Step-by-step troubleshooting for CRC errors, timeouts, and wiring problems. How to read Modbus RTU frames and diagnose RS485 bus issues.
Read articleModbus TCP Tool for macOS: Test and Debug Devices Without Windows (2026)
Need a Modbus TCP tool on macOS? MacTools Modbus Poll is a native Mac app for testing and debugging Modbus TCP devices. Read/write registers, simulate slaves, verify register maps.
Read articleMQTT Sparkplug B Explained: Industrial IoT Protocol Guide (2026)
MQTT Sparkplug B explained for industrial automation. Understand topics, payloads, birth/death certificates, data types, and how Sparkplug B compares to basic MQTT.
Read articleTIA Portal on Mac (2026): Why It Doesn't Work & What to Use Instead
TIA Portal doesn't run on macOS. Here's why, what your options are (Parallels, Remote Desktop), and the native macOS alternative for PLC programming.
Read articleUSB to RS485 on macOS (2026): Adapter Guide for Apple Silicon
Complete guide to USB-RS485 adapters on macOS. FTDI, CH340, CP2102 driver installation for Apple Silicon. Troubleshooting port detection, wiring RS485 devices.
Read articleCODESYS Alternative for macOS (2026): Native PLC IDE Without Windows
CODESYS doesn't run on macOS. The best CODESYS alternative for Mac is native, costs under $30, and includes a full softPLC runtime. Compare features, pricing, and workflow.
Read articlePLC Programming Languages: The 5 IEC 61131-3 Languages Explained
The 5 IEC 61131-3 PLC programming languages explained: Structured Text, Ladder Diagram, Function Block Diagram, Sequential Function Chart, and Instruction List.
Read articleIEC 61131-3 Structured Text: A Practical Guide for Modern PLC Programming
Learn IEC 61131-3 Structured Text (ST) — the modern way to program PLCs. Syntax, data types, function blocks, timers, counters, and real examples.
Read articlePLC Programming on Mac (2026): Write, Run, and Test Without Windows
Write and run PLC programs on your MacBook — no Windows VM, no CODESYS, no TIA Portal. IEC 61131-3 Structured Text editor with built-in softPLC runtime. Native Apple Silicon.
Read articlePLC Simulator for macOS: Write, Compile, and Test Without Hardware (2026)
PLC simulator for macOS. Write IEC 61131-3 Structured Text, compile, and run on a built-in softPLC runtime — no hardware needed. Breakpoints, watch tables, and real I/O drivers.
Read articleWhat Is a SoftPLC? Run PLC Programs on Your Mac Without Hardware
A SoftPLC lets you write, compile, and run IEC 61131-3 programs entirely in software on your Mac — no PLC hardware needed. Learn how softPLCs work and what they can do.
Read articleStructured Text vs Ladder Logic: Which PLC Language Should You Learn?
Structured Text vs Ladder Logic — honest comparison for 2026. ST is better for complex logic, math, and modern workflows. LD is better for maintenance and troubleshooting simple circuits.
Read articleTwinCAT Alternative: PLC Development Without Beckhoff Lock-In (2026)
TwinCAT locks you into Beckhoff hardware and Windows. Compare alternatives: Voltrus PLC (macOS native, IEC 61131-3 ST, multi-vendor I/O), CODESYS, and OpenPLC.
Read articleSCADA Alarm Management: Best Practices for ISA-18.2 Compliance (2026)
SCADA alarm management guide. Reduce alarm floods, implement ISA-18.2 best practices, configure deadbands, and improve operator response. Metrics, rationalization, and shelving.
Read articleSCADA Kiosk Mode: Lock Down Operator Consoles Without Tauri
Deploy SCADA in locked-down kiosk mode on dedicated operator consoles. Full-screen, no Alt-Tab, auto-start on reboot, no right-click — using just systemd and X11.
Read articleWhat Is Modbus? The Protocol That Runs Industrial Automation
Modbus explained for engineers: how it works, why it's still dominant after 50 years, and the difference between Modbus RTU, TCP, and ASCII.
Read articleModbus RTU vs TCP: Which Variant Should You Use?
Modbus RTU and Modbus TCP use the same protocol but different transports. Frame format, speed, device limits, and when to choose each variant.
Read articleModbus Register Types Explained: Coils, Discrete Inputs, Holding Registers, Input Registers
The four Modbus data types and their function codes. How to read coils (FC01), write registers (FC06/FC16), and avoid common addressing mistakes.
Read articleS7 Communication Protocol Guide: Memory Areas, Addressing, and Data Types
How the Siemens S7 protocol accesses PLC memory. Data blocks, inputs, outputs, markers, timers, counters. Rack/slot addressing and data type mapping.
Read articleRS-232 vs RS-485 vs RS-422: Serial Communication Protocols Compared
UART, RS-232, RS-485, and RS-422 explained. Distance limits, device count, noise immunity, and which serial standard your industrial equipment uses.
Read articleMQTT QoS Levels Explained: When to Use QoS 0, 1, or 2
MQTT QoS 0, 1, and 2 explained with practical examples. At-most-once, at-least-once, exactly-once delivery for IoT and industrial systems.
Read articleIndustrial Protocol Comparison: Modbus vs OPC UA vs MQTT vs S7
Side-by-side comparison of the four most common industrial protocols. Data models, security, speed, vendor lock-in, and when to use each one.
Read articleSCADA vs HMI: What's the Difference and Do You Need Both?
The practical difference between SCADA and HMI for system integrators. When you need one, the other, or both — and why the distinction matters for your next project.
Read articleSCADA vs IoT: Why Industrial Monitoring Isn't Just "Smart Devices"
SCADA vs IoT for industrial monitoring. Overlap, differences, and why protocol support matters more than buzzwords for system integrators.
Read articleSCADA Architecture Explained: RTU, PLC, HMI, and How They Connect
SCADA architecture from field devices to the control room. RTUs, PLCs, HMIs, and how data flows from a sensor reading to a dashboard alert.
Read articleVoltrus vs Wonderware (AVEVA): Cost, Complexity, and What Integrators Actually Need
Voltrus vs AVEVA Wonderware comparison for system integrators. Pricing, deployment complexity, protocol support, and when each makes sense.
Read articleVoltrus vs Kepware: Protocol Gateway vs Full SCADA
Kepware is a protocol gateway, not a SCADA system. Here's how Voltrus compares — and why you might need both instead of choosing one.
Read articleConnecting Siemens PLCs Without TIA Portal: A Practical Guide
You don't need TIA Portal to monitor Siemens S7 PLCs. How to connect S7-1200 and S7-1500 directly from your SCADA using the S7 protocol.
Read articleDo You Need to Know PLC Programming to Use SCADA?
No, you don't need ladder logic to set up SCADA monitoring. Here's why SCADA and PLC programming are separate skills — and what you actually need to know.
Read articleSCADA Redundancy: How to Build a High-Availability Industrial Monitoring System
SCADA redundancy patterns for 99.9% uptime. Cold standby, warm standby, hot standby, and when each makes sense for industrial monitoring.
Read articleIndustrial Dashboard Design: 12 Principles That Separate Useful Screens from Wallpaper
12 principles for designing industrial dashboards that operators actually use. Based on real SCADA deployments, not design theory.
Read articleBACnet Explorer for macOS: Browse Building Automation Devices Without Windows
Discover, monitor, and control BACnet/IP devices on macOS. Browse objects, read and write properties, and inspect real-time values across BACnet networks. No Windows, no costly BACnet software.
Read articleEtherNet/IP Explorer for macOS: Connect to Allen-Bradley PLCs Without RSLinx
Browse tags, read and write controller data on Allen-Bradley ControlLogix and CompactLogix PLCs over EtherNet/IP. Native macOS app — no RSLinx, no FactoryTalk, no Windows.
Read articleDNP3 Explorer for macOS: Monitor SCADA Outstations on Utilities and Water Systems
Monitor DNP3 outstations, read binary/analog points, and scan Class 0/1/2/3 events on macOS. Built for utilities and water/wastewater using DNP3 protocol.
Read articleOPC-UA Explorer for macOS: Browse OPC-UA Servers Without UA Expert
Browse OPC-UA address spaces, subscribe to variable changes, and read/write node attributes on macOS. Connect to any OPC-UA server without Windows tools.
Read articleHow to Run a Self-Hosted Pastebin on Cloudflare Workers
Deploy a self-hosted pastebin on Cloudflare Workers, D1, and R2 in under 5 minutes. No servers, no Docker, no recurring costs. Zero data leaves your Cloudflare account.
Read articleHow to Share Files Between Remote Servers Without Cloud Storage
Remote server file sharing without cloud storage. Transfer logs, configs, and screenshots between isolated networks using a self-hosted pastebin. No Dropbox, no Google Drive.
Read articlePastebin Alternatives 2026: Why Self-Hosted Beats SaaS for Engineers
Comparing Pastebin.com, PrivateBin, GitHub Gist, and self-hosted pastebins. Why engineers working on remote client infrastructure should self-host their pastebin on Cloudflare Workers.
Read articleModbus Poll for macOS: A Native Alternative That Actually Works
Looking for Modbus Poll on macOS? MacTools Modbus Poll is a native Mac app for reading and writing Modbus TCP and RTU registers. Master + slave simulator with device templates. $29.99 one-time.
Read articleBest Modbus Simulator for macOS (2026): PM5560, SMA Inverter, and More
Modbus simulator with real device templates. Simulate Schneider PM5560 power meter, SMA solar inverter, ABB analyzer on macOS. No Parallels, no Windows.
Read articleSchneider PM5560 Modbus Register Map and Simulator
Complete PM5560 Modbus register map with addresses for voltage, current, power, power factor, frequency, and energy. Includes a PM5560 simulator for macOS.
Read articleSerial Terminal for macOS: Alternatives to screen, minicom, and CoolTerm
Best serial terminal apps for macOS in 2026. Compare screen, minicom, CoolTerm, Serial by Decisive Tactics, and MacTools. Hex view, protocol analysis, USB-RS485.
Read articleMQTT Broker on macOS: Run One Without Homebrew or Terminal
How to run an MQTT broker on macOS without Homebrew, Terminal, or mosquitto. Native MQTT broker and client with GUI for macOS.
Read articleConnect to Siemens S7-1200/1500 from macOS Without TIA Portal
Read and write Siemens S7 PLC data blocks from macOS. No TIA Portal, no Parallels, no Windows. Native S7 communication tool for Mac.
Read articleBLE Debugging on macOS: nRF Connect Alternatives That Actually Work
BLE debugging tools for macOS when nRF Connect won't install. Scan, connect, browse GATT services, read/write characteristics on macOS.
Read articleThe Problem Isn't Expensive SCADA. It's Getting In.
AVEVA charges $50K/year. Ignition starts at $6K. The real barrier isn't the price — it's the entry point. Why $249 changes everything for mid-market manufacturers.
Read articleOT Security Checklist: 15 Steps to Harden Your SCADA System
Actionable security checklist based on real OT breach analysis and IEC 62443 best practices. Default credentials, network segmentation, monitoring, and more.
Read articleYour Predictive Maintenance Journey Starts with Getting the Data
Most predictive maintenance projects die at Phase 1: extracting data from legacy PLCs. Voltrus is the data plumbing that makes analytics possible.
Read articleSCADA SSO: Why Active Directory Integration Matters for Industrial Systems
"Does it integrate with our Active Directory?" is the question that kills SCADA deals. How SSO support for AD, Azure AD, Okta, and SAML changes the conversation with enterprise IT.
Read articleFDA 21 CFR Part 11 Compliance for SCADA: What Integrators Need to Know
Pharma, food, and beverage integrators need audit trails, electronic signatures, and access controls. What CFR Part 11 actually requires from SCADA — and how to deliver it without $10K+ consulting.
Read articleConnecting Siemens S7 and Allen-Bradley PLCs to Your SCADA Without Kepware
The "protocol tax" costs $1K-$5K per PLC brand for OPC server licenses. Voltrus Enterprise ($999) includes Modbus, OPC-UA, Siemens S7, and Allen-Bradley EtherNet/IP — no separate server needed.
Read articleOEE and Downtime Tracking in SCADA: What Every Plant Manager Actually Wants
Every plant manager asks for OEE. Most get quoted $50K+ MES systems. What 90% of small sites actually need is machine state tracking, downtime reason codes, and shift reports — built into Voltrus Starter at $249.
Read articleIs There Any SCADA Under $1,000? (Yes, and It's Not Open Source)
Ignition Edge costs $1,850. Full Ignition starts at $6K+. Someone on Reddit asked "Is there any SCADA under $250?" — here's the answer, with pricing tiers that fit every project size.
Read articleBest SCADA Software Alternatives for System Integrators in 2025
Honest comparison of SCADA software options: Ignition, Node-RED, Voltrus, OpenSCADA, and more. Pricing, features, and when to choose each.
Read articleVoltrus vs Ignition: An Honest Comparison for System Integrators
Architecture, pricing, deployment, and maintenance compared. Which SCADA platform makes sense for your next industrial monitoring project?
Read articleFree SCADA Software: What's Actually Free and What's Not
Not all free SCADA software is truly free. Open source options, freemium traps, and hidden costs — broken down so integrators can make informed decisions.
Read articleRunning SCADA on a Raspberry Pi: Why Edge Computing Wins for Industrial Monitoring
Edge computing is changing industrial monitoring. Why running SCADA on a Raspberry Pi or ARM gateway beats cloud-dependent architectures.
Read articleIndustrial Dashboard: Build vs Buy for System Integrators
Build with the Grafana stack or buy off-the-shelf SCADA? Real cost breakdown — development hours, maintenance burden, and total cost of ownership compared.
Read articleModbus TCP vs OPC-UA: What System Integrators Actually Need to Know
Modbus is simple. OPC-UA is complex. Here is the honest comparison: when each makes sense, and why the middleware gap matters.
Read articleSingle Binary vs Microservices: Why SCADA Should Not Be Distributed
Distributed systems fail in industrial environments. One binary, one process, one log. Why less is more when your client needs monitoring that just works.
Read articleHow System Integrators Should Price Industrial Monitoring Projects
The SaaS reseller trap: you do the work, they keep the recurring revenue. Here is how to price monitoring projects so you keep the margin.
Read articleOn-Premise vs Cloud SCADA: Why Air-Gapped Deployments Still Matter
Factories cannot rely on cloud connectivity. Internet goes down, data stays local. Why on-premise wins for industrial monitoring.
Read articleSCADA Software Pricing: Why Lifetime Licenses Beat SaaS Subscriptions for Integrators
SaaS SCADA pricing erodes integrator margins and strains client budgets. See the lifetime license vs subscription math, and why owning the license changes everything.
Read articleTerminal Database Browsers — Why CLI Tools Beat pgAdmin and SSMS for Daily Work
pgAdmin and SSMS are heavy, slow to open, and impossible over SSH. Terminal database browsers like PostgresTUI, Sqltui, and MSSQLTui give you instant access to your data.
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