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docs(abcip): Large Forward Open refusal targets and ConnectionSize honouring (T21 review r1 M6)

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The 5069-L3x supports the Large open, as the press proved. The narrow/refusing case is a pre-v20 1769-L3x or a bridge. AbCipDeviceOptions.ConnectionSize: the native transport honours it on the wire; libplctag ignores it.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-07 20:16:34 -04:00
parent 6ae6287360
commit df77617051
3 changed files with 5 additions and 7 deletions
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docs/drivers/AbServer-Test-Fixture.md
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@@ -120,7 +120,7 @@ happens when a non-safety write lands on a real `1756-L8xS` — is not exercised
Since T21 the CompactLogix profile defaults to a **Large** Forward Open (4002), matching what libplctag
opens for `plc=compactlogix`. The old 504 default was cosmetic under libplctag, which never received it,
and cost the native transport ~3× the round trips per poll. A narrower 5069-L3x / pre-v20 target that refuses
and cost the native transport ~3× the round trips per poll. A pre-v20 CompactLogix (1769-L3x) or a bridge that refuses
the Large open is handled by `CipConnection`'s fallback (a regular open at min(size, 504) in the same
throttled attempt). That fallback is pinned by unit tests against a fake target only: `ab_server` accepts
any size, so a refusing controller is never exercised here.