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Auto: ablegacy-3 — sub-element bit semantics

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Closes #246
This commit is contained in:
Joseph Doherty
2026-04-25 13:41:52 -04:00
parent 07235d3b66
commit c89f5bb3b9
6 changed files with 350 additions and 5 deletions
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8
src/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy/LibplctagLegacyTagRuntime.cs
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@@ -40,8 +40,14 @@ internal sealed class LibplctagLegacyTagRuntime : IAbLegacyTagRuntime
AbLegacyDataType.Long => _tag.GetInt32(0),
AbLegacyDataType.Float => _tag.GetFloat32(0),
AbLegacyDataType.String => _tag.GetString(0),
// Timer/Counter/Control sub-elements: bitIndex is the status bit position within the
// parent control word (encoded by AbLegacyDriver from the .DN / .EN / etc. sub-element
// name). Word members (.PRE / .ACC / .LEN / .POS) come through with bitIndex=null and
// decode as Int32 like before.
AbLegacyDataType.TimerElement or AbLegacyDataType.CounterElement
or AbLegacyDataType.ControlElement => _tag.GetInt32(0),
or AbLegacyDataType.ControlElement => bitIndex is int statusBit
? _tag.GetBit(statusBit)
: _tag.GetInt32(0),
_ => null,
};