The OPC UA reference engineers actually use
Status codes with real fixes. A glossary that defines things precisely. The IEC 62541 parts explained without a PDF download. And a free academy that takes you from first connection to machine data for OEE.
Paste the status code you actually got.
BadCertificateUntrustedTrust store
BadCertificateHostNameInvalidSAN mismatch
BadConnectionRejectedPort / firewall
BadNodeIdUnknownNamespace shift
All 127 codes →
Free OPC UA training, no PLC required
Four tracks. Written lessons and transcripts open to everyone; video, labs and exams behind a free account. Every exercise runs against a public OPC UA server.
Foundations
Track A takes you from knowing nothing about OPC UA to holding a working, tuned subscription against a real server. It covers what OPC UA is, how to c
Build
Track B is for people writing code. It covers events, alarms and historical access, authoring your own information model, certificates and PKI properl
Industrial
Track C is the one that reaches the plant. It covers companion specifications: the standard information models that make integration portable between
Operate
Track D is about running OPC UA in production. A troubleshooting clinic that fixes broken configurations on camera, deployment and scaling for a plant
Open, and staying open
No email wall on anything written. This is the part of OPC UA that nobody has published well, and gating it would defeat the point.
Status codes
What the code means, the real causes in order of frequency, and the fix: in diagnostic order.
127 codes →Glossary
One concept per page, defined precisely, with the mistake engineers actually make with it.
134 entries →IEC 62541 parts
What each numbered part governs and whether you need to read it. No PDF, no registration.
32 parts →Companion models
DI, Machinery, MachineTool, PackML: with real type names and what each gives you for OEE.
52 models →SDKs and code
The same twelve tasks in every stack, pinned to a version, runnable against a public server.
All stacks →Integrations
Siemens, Beckhoff, Ignition, Grafana, OPC Publisher: including the licensing traps.
All integrations →If you are new to OPC UA
Free account, everything unlocked
Video, labs, code bundles, progress tracking and the credential exams. No card, no trial, no sales call.
Create a free account →