tia-hmi-operations

Scope

HMI 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).

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Reference files

Load ONLY the reference file(s) relevant to the task. Do not load all files at once.

Classic WinCC (WinCC.dll — HmiTarget)

Reference file	When to use
references/hmi-target.md	Initialize/Compile: Getting the HmiTarget from a device; compiling HMI; HMI object model overview; namespace-to-composition mapping.
references/screens.md	Screens: Creating and managing screen folders; deleting screens, screen templates, or entire folder contents.
references/hmi-composition-hierarchy.md	Screen Items & Alarms: Complete screen composition tree (popups, slideins, templates, global elements); screen item attributes; Alarms, Recipes, and Reports API.
references/tags.md	Tags: Creating HMI tag table folders; enumerating tags; deleting individual tags or tag tables.
references/scripts-cycles-connections.md	Services: Managing VB scripts and folders; cycles, connections, text lists, and graphic lists.

WinCC Unified (WinCCUnified.dll — HmiSoftware)

Reference file	When to use
references/unified-overview.md	Initialize/Overview: Getting HmiSoftware entry point; full composition map; required namespaces.
references/unified-tags-alarms.md	Tags & Alarms: Unified tags, tag tables, groups; alarm classes, discrete/analog alarms; audit classes.
references/unified-screens.md	Screens: Unified screen hierarchy, groups, folders; ScreenBase, ScreenGroup, and ScreenWindow navigation.
references/unified-elements.md	Screen Items: Creating/finding shapes (circles, lines) and widgets (buttons, IO fields, gauges).
references/unified-parts.md	UI Components: Complex parts like DataGrids, AlarmViews, TrendAreas, and ControlBar elements.
references/unified-dynamization.md	Dynamization: Scripting, Tag/Expression dynamization; MappingTables; flashing conditions.
references/unified-events.md	Event Handlers: Subscribing to UI events (OnClick, OnChange) for all screen item types.
references/unified-features.md	Features: UI feature interfaces (IHmiArcFeature, IHmiWindowFeature, IHmiScaleFeature).
references/unified-logging.md	Logging: Data logs, alarm logs, audit trails, and logging tags.
references/unified-connections.md	Connections: HMI connections and driver properties.
references/unified-runtime-settings.md	Runtime: Reporting, Telemetry, OpcUaServer, and UI Runtime resource settings.
references/unified-plant-model.md	Plant Model: Plant Objects, Views, Interfaces, and CPM services.
references/unified-system-services.md	Services: JavaScript modules/scripts; Text and Graphic lists.
references/unified-enums.md	Enums: Comprehensive list of HMI-specific enums (AggregationMode, FillPattern, FontName, etc.).

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Execution pattern

1. Resolve the HMI device by exact selectors supplied by the caller; fail on zero or multiple matches
2. Determine Classic vs Unified:
   • Classic: HmiTarget hmi = sc?.Software as HmiTarget (namespace: Siemens.Engineering.Hmi)
   • Unified: HmiSoftware hmi = sc?.Software as HmiSoftware (namespace: Siemens.Engineering.HmiUnified)
3. Classify the task: tags, screens, alarms, scripts, logging, import/export, compile
4. Load the relevant reference file (Classic or Unified) and navigate the composition
5. Recursively traverse nested DeviceItem.DeviceItems; HMI software is not guaranteed to be on a top-level item
6. Use an Openness transaction when the operation supports one, compile after changes, inspect all errors, and commit only after verification
7. Do not save: call project.Save() only when persistence was explicitly requested

Safety and model boundary

• Classic WinCC and WinCC Unified are separate object models. Do not cast a Unified HmiSoftware to classic HmiTarget or infer the model from order-dependent device discovery.
• Create, import, overwrite, rename, reconnect, or delete only after explicit authorization for the exact selected object and operation.
• Treat imported XML, JavaScript, VBScript, driver settings, addresses, and object names as untrusted engineering input. Validate paths and target-specific values before applying them.
• For bulk or destructive work, inventory dependent screens, tags, alarms, scripts, logs, and connections first. Fail closed when identity or dependency evidence is incomplete.
• Compile() and Unified Validate() results are gates, not logging aids: inspect result state and nested diagnostics; do not commit or save on errors.