Plain-language explanations of OPC, IIoT, cybersecurity, data architecture, and Industrial AI concepts, written by engineers, for engineers and the business leaders who work with them.
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The foundational standard for hardware-software interoperability, OPC DA, UA, HDA, A&E, DDE, DCOM, ActiveX, and the client-server model explained. We even cover things like InTouch LGH Files!
The industrial interoperability standard, what it means, how the client-server model works, and why it matters for your data strategy.
Platform-independent successor to OPC Classic, security, information model, pub/sub transport, and why it's the foundation for IIoT and UNS.
Real-time data access, how OPC DA 2.0 and 3.0 work, when you still need it, and how it coexists with OPC UA in modern plants.
Role, architecture, and the client-server model explained for engineers evaluating connectivity options or explaining OPC to stakeholders.
Moving OPC data securely across networks and DMZs without DCOM, how tunneling replaces brittle DCOM configurations with TCP-based transport.
Historical data access for retrieving archived process data, raw reads, interpolated values, aggregates, and when HDA vs OPC UA HA.
Alarms & Events, the OPC standard for subscribing to, acknowledging, and managing process alarms through a common interface.
Microsoft's COM-based framework that became the foundation of OPC Classic (DA/HDA/A&E), its limitations, and the path to OPC UA.
Microsoft's Distributed COM technology that OPC Classic uses for remote connections, why it's complex to configure, Windows hardening impacts, and migration paths.
Dynamic Data Exchange, the original Windows IPC that pre-dated OPC, Application|Topic!Item addressing, and TOP Server's DDE Client Bridge for legacy systems.
AVEVA InTouch (formerly Wonderware) users know this term well. It's an important part of the InTouch product, storing local history on the HMI node, but in format that is not easily decoded, but a solution exists. Learn more
Unified Namespace, MQTT, Sparkplug B, historians, edge computing, data contextualization, and the architectural patterns that connect OT to IT and cloud.
UNS as the single source of truth for industrial data, MQTT brokers, Sparkplug B, context modeling, and how it replaces the ISA-95 pyramid.
Bridging enterprise IT and operational technology, the technical and organizational challenges, where connectivity breaks down, and how to fix it.
Time-series process data storage, how historians work, the major platforms, and how OPC feeds them.
Lightweight pub/sub messaging for IIoT, brokers, topics, QoS levels, and why Sparkplug B matters for industrial use cases.
The MQTT specification for industrial data, defined payload structure, birth/death certificates, and state management for reliable OT pub/sub.
Local data processing at the machine level, latency, bandwidth reduction, and running AI models close to the source on Linux-based edge hardware.
Adding meaning to raw OT data, metadata, asset models, semantic enrichment, and why contextualized data is the prerequisite for industrial AI.
The Purdue Model (PERA) organizes industrial control systems into six functional levels from sensors to enterprise. Understand how it became the dominant framework for ICS network segmentation.
The 5-layer data architecture that carries process data from field sensors through edge compute, across the iDMZ, into MES and historian, and up to ERP and cloud AI.
The native languages of industrial hardware, Modbus, EtherNet/IP, PROFINET, DNP3, and how device drivers bridge them to OPC.
How communication drivers translate between native device protocols and software applications, and why driver quality matters for reliable data.
The most widely deployed serial protocol in industrial automation, RTU, TCP, ASCII variants, function codes, and how to access Modbus data via OPC.
The open ASHRAE/ISO/IEC standard for building automation communication. BACnet/IP, MS/TP, objects, properties, COV, and how TOP Server connects BACnet devices to OPC.
Rockwell's industrial Ethernet protocol, CIP messaging, implicit vs explicit connections, and EtherNet/IP in Allen-Bradley PLC environments.
Siemens-led industrial Ethernet standard, RT and IRT variants, device models, controller/device roles, and integration with Siemens SIMATIC environments.
The SCADA protocol for utilities and oil & gas, outstations, masters, event-driven data reporting, and DNP3 Secure Authentication.
International standard for substation automation defining GOOSE for fast protection trips, MMS for SCADA data access, and SCL for device configuration.
ROC, Enron Modbus, ABB Totalflow, Bristol IP, and Floboss — the specialized protocols that oil and gas flow computers use.
Complete guide to EtherNet/IP, DF1, DH+, ControlNet, DeviceNet, and CSP/PCCC protocols for Allen-Bradley controllers.
Complete guide to S7 Comm, S7 Comm Plus, MPI, Profibus, PPI, AS511, 3964R, and OPC UA for all SIMATIC generations.
Complete guide to FINS Ethernet, FINS Serial, EtherNet/IP, Host Link, Toolbus, and Process Suite for Omron controllers.
Complete guide to SRTP Ethernet, EGD, SNP, SNPX, and CCM protocols for GE/Emerson PACSystems and legacy controllers.
Complete guide to HC900 Modbus and UDC Modbus protocols for Honeywell hybrid and loop controllers.
Complete guide to DX, SMARTDAC+, Darwin, MX100, MW100, CX, PCLink, HR2400, and Green Series protocols for Yokogawa recorders.
Securing industrial networks, ICS/SCADA defense, the industrial DMZ, and how connectivity architecture supports defense-in-depth.
Securing operational technology networks, ICS threat landscape, defense-in-depth for industrial environments, and how connectivity products fit into OT security architecture.
Securing industrial control systems and SCADA networks, common attack vectors, NIST and IEC 62443 frameworks, and practical defenses for control system environments.
The iDMZ at Purdue Level 3.5, how it protects OT from IT threats while enabling data flow, and how Cogent DataHub provides outbound-only OPC tunneling across the boundary.
Software Toolbox has been solving industrial connectivity challenges since 1996. Whether you're evaluating OPC servers, building a Unified Namespace, or planning an AI readiness initiative, our engineers have seen it before.
