tia-plc-operations

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, safety relations, publish safety blocks | | references/safety-administration.md | Global safety settings, SafetyAdministration, safety signature, safety system version, safety runtime groups, safety validation assistant | | references/alarms.md | PLC alarms, alarm classes, alarm text lists, PlcAlarmTextProvider | | references/technological-objects.md | Technological Objects (TOs), motion control, axes, encoders, TO mapping, hardware connections | | references/watch-force-tables.md | Watch tables, force tables, PlcWatchTable, PlcForceTable, watch entries | | references/opc-ua.md | OPC UA server interfaces, OPC UA communication groups, access control, role mapping | | references/supervision.md | Supervision settings, supervision provider, supervision export/import |

For tasks spanning multiple areas, load all relevant reference files before generating code.

Stub behaviour

If a task targets a partial reference file, do not invent API calls. State clearly which sections are missing. The only remaining stub is import/export signatures in compile-import-export.md — all other files are complete.

Execution pattern

1. Access PlcSoftware via device's SoftwareContainer
2. Identify which reference file(s) cover the task — load them
3. Navigate Openness object model per reference file patterns
4. For online work: use OnlineProvider service on the CPU DeviceItem (see online-status.md)
5. For compare: use CompareTo / CompareToOnline on PlcSoftware or Device (see compare.md)
6. For software units: access via PlcUnitProvider service on PlcSoftware (see software-units.md)
7. For safety unit: access via PlcUnitProvider.UnitGroup.SafetyUnits (see safety-unit.md)

Access pattern (always needed)

using Siemens.Engineering.HW.Features;
using Siemens.Engineering.SW;

// From a DeviceItem (CPU)
SoftwareContainer sc = deviceItem.GetService<SoftwareContainer>();
PlcSoftware plcSoftware = sc?.Software as PlcSoftware;