tia-plc-operationslisted

# tia-plc-operations ## Scope PLC software engineering — full C# Openness implementation. When the roadmap routes here, the entire solution is C#. Do not mix with Python wrapper calls. Always load `tia-csharp-common` first (done by roadmap). --- ## Reference files Load ONLY the reference file(s) relevant to the task. Do not load all files at once. | Reference file | Load when the task involves | | --- | --- | | `references/online-status.md` | Going online/offline, reading PLC state, configuring connection parameters, `OnlineProvider`, `OnlineState`, `ConnectionConfiguration` | | `references/compare.md` | Comparing PLC software or hardware, `CompareResult`, `CompareResultState`, `CompareToOnline`, `UpdateProgram` | | `references/blocks.md` | Program blocks, system blocks, `PlcSoftware` root, know-how/write protection, block groups, ProDiag-FB, DataBlock snapshots, compile individual block/UDT, fingerprints, webserver pages, OB priority, loadable file | | `references/external-sources.md` | PLC external source files, importing/generating blocks from sources, `PlcExternalSource`, `PlcExternalSourceGroup` | | `references/tags-types.md` | PLC tag tables, tags, user constants, system constants, UDTs, PLC types, UDT group navigation | | `references/software-units.md` | Software units (`PlcUnit`), `PlcUnitProvider`, unit relations, unit access/publish, namespaces, name value type documents | | `references/safety-unit.md` | Fail-safe unit (`PlcSafetyUnit`), SafetyUnit access, sa