[masarray]

Field requirement

User requests IEC 61850 DPC position state, not generic on/off: Open [01], Close [10], with the important additional valid codes Intermediate [00] and Bad state [11]. A raw 00 on XCBR.Pos must remain intermediate, not be silently treated as Open.

Core behavior

• Reuse the existing Iec61850ValueFormatter.FormatReportProcessValue(..., "Dbpos", ...) — do not invent a second MMS enum decoder.
• Build one cheap exact reference + FC typed DPC index from the current per-IED LiveDiscoveryModel/SCL-backed model. Proof is declared DPC CDC, Dbpos attribute BType, or standard IEC XCBR/XSWI/CSWI.Pos.stVal [ST] when the CDC isn't explicitly contradicted.
• Both logical DO Pos and declared Pos.stVal rows get the same presentation, across Data Model, DataSets and Reports via the already common Browser visible-value refresh. The canonical IedBrowserLiveValues ledger remains raw and association-scoped; no extra cache, polling, read, write or RCB changes.
• Remove unsafe generic Enum=1 => Open and Enum=2 => Closed in the non-DPC formatter. Mod/Beh/health and arbitrary vendor enumerations must never be shown as circuit-breaker position without exact typing.
• Respect explicit contrary CDC metadata; unknown or unverified Pos in an unrecognized LN remains raw.

Regression and qualification

• IEC all four 2-bit codes in numeric/text/raw MMS BIT STRING representations; XCBR, XSWI and CSWI; vendor DPC via exact CDC/BType; exact FC, reference and sibling isolation; leave Mod/Beh/generic enums unchanged; project a single canonical Report observation to both Browser views without modifying raw value/quality/association.
• Stacked on #602. One exact-SHA CI validation only; keep draft until BCUGE hardware acceptance. This is the typed presentation/SSOT consumption slice of M2.17, not a claim that connect-time Data Model hydration is complete.

[masarray]

D7 complete five-file typed DPC owner/value semantic reconciliation

Disposition A: close historical PR unmerged after full original→RC per-file source+regression inspection. Historic head b59f4951065db528d657f0f6c7ef680c6c4e01ed is exact ancestor of protected draft RC 817c3910e8223fa2ac531a4426ada5d2d4bbbe50 (+1243/−0, merge-base historic HEAD), with all five paths semantically retained or tightened. Original branch and raw evidence are recoverable; do NOT merge obsolete implementation over current RC.

Canonical replacement: protected draft RC #727 / #729 at 817c3910e8223fa2ac531a4426ada5d2d4bbbe50.

Unique delta, exact path proof:

1. Models/IedBrowserDoublePointPresentation.cs: original blob 9ac4b65db122904f7b03a6898f019cda5496c21b → current 97672095520873b661121e08d32b9e7a83cff0f7; still converts only model-authorized DPC/Dbpos exact value owner to IEC Intermediate [00], Open [01], Close [10], Bad state [11], preserving underlying raw ledger/Report/Read. Current implementation adds tightly gated SV substituted-value and two-bit status-candidate handling, with separate 13-bit subQ quality projection. This is additive and not equivalent to mapping arbitrary enums by name.
2. Models/IedBrowserSchemaIndex.cs: original blob 979468d162eebd78e1e8b752dea1f702778667f0 → 7ef8005052527d2e70e4b5228309bf4f0c172f9d; original exact ST stVal/DO declaration set _declaredDoublePointValues, IsDeclaredDoublePointValue, verified CDC DPC or Dbpos BType, and narrowly standard XCBR/XSWI/CSWI Pos fallback persist. Conflicting explicit CDC and unrelated LN remain disallowed. Current schema gates extra wire-backed formats, never a name-only value cache.
3. Services/Iec61850ValueFormatter.cs: old 040edb34bf91d8c85bd7565db4c4a9d4b1492368 → RC 2c1646b60815c612eb111c5aaca4863adb6e2510; generic int i => AppendUnit(...) no longer mislabels every Enum=1/2 as breaker Open/Closed. DPC interpretation remains in explicitly typed process formatter.
4. MainWindow.IedBrowser.cs: old b1a512535f0227f2e41fba9194961c673d8cb337 → RC 21a0551413a5437a562c463f011204868aab7b3e; retains read-only IedBrowserDoublePointPresentation.Format for current canonical observedReference + exact row ref/FC, and only for non-evidence field, before engineering display, with no ledger mutation or Report ownership overwrite.
5. tests/ARSAS.Tests/M217TypedDoublePointLiveModelTests.cs: historic c7efb4fec3053ceb6caea4fd0e90349a92a4179a → RC ec680b4ad8d72faf6720fac8b98057e96a9d5ba3. All 8 original test methods and EVERY original Assert / InlineData line remain, including four 2-bit value states, standard switching LN and vendor DPC, contradictory CDC failure, Data Model & DataSets same raw SSOT evidence, and generic Enum no false switch state. RC adds extra SV/fallback and quality regressions.

Safety: Administrative closure only. No source write, main merge, engine repin, Control/Write/RCB/GOOSE transmission, stable v1.6.42, or new physical trial. #753 six-file exact-head Windows/native/portable and SCL CI succeeded but does not independently qualify DPC state mapping on real relay, nor hardware R7/R10. #606 and #615 stay OPEN.

Follow-up: Validate exact IEC four-state display using typed C264/F650 observed stVal and connected latest model, verifying contradictory CDC/FC remains fail-closed. No process command or assumed q/t is authorized by this historical closure.