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docs(abcip): #592 native array-element write on Z35162 (_SEQ_EP[31], user-approved, restored)

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Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-09 06:41:14 -04:00
parent c36224d956
commit a7c27e978f
3 changed files with 19 additions and 5 deletions
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docs/drivers/AbCip.md
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@@ -249,13 +249,14 @@ The driver has two interchangeable wire transports, selected by one `DriverConfi
(DINT `test2`, BOOL `Program:UN01_Press.xxtest`, REAL `Program:ES03_EM03_Zone3._ff_test`: write, read back, restore, all
Good), and the #611 gate added **native UDT member writes** (DINT, BIT and REAL members of `_EmptyTemperatureSegment`).
hw5 (2026-10-09) added a **native STRING write** (`Program:ES03_TemperatureControl._StrTmp`, through the driver:
write, read back, restored byte-exact). Still ab_server-only: array (element) writes — no logic-unreferenced array
exists on Z-35162 (`_SEQ_EP` is aliased into live sequencer step registers) — libplctag member writes, and fragmented
writes. #566 is answered (the controller drops TCP; see "A target-closed CIP connection"). Mixed STRING/array/scalar
write, read back, restored byte-exact). A user-approved **native array-element write** followed: `Program:EM01_PowerUnit._SEQ_EP[31]`
0→4242→0 (the array's only alias targets `[1]`, no routine indexes or block-copies it; all 32 elements snapshotted
twice before, after the write and after the restore — only `[31]` changed). Still ab_server-only: whole-array
writes (the driver has none), libplctag member writes, and fragmented writes. #566 is answered (the controller drops TCP; see "A target-closed CIP connection"). Mixed STRING/array/scalar
Multiple Service Packet reads (#582) are proven on the press (one 5-read MSP, values equal to single reads). Results:
[native-ab-transport-gate-results](../plans/2026-10-07-native-ab-transport-gate-results.md).
- **libplctag cannot be deleted yet.** Scalar, UDT-member and STRING native writes are proven on a CompactLogix
(2026-10-09); what remains is #567 (fragmented wide-struct writes), array element writes on hardware, and AbLegacy
(2026-10-09); what remains is #567 (fragmented wide-struct writes), whole-array writes on hardware, and AbLegacy
native beyond the MicroLogix 1400 evidence.
- UDT **member writes** (#611) are proven on a real CompactLogix on the **native** transport only (2026-10-09); the
libplctag member-write path is `ab_server`-only. See [Member writes](#member-writes).