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fix(abcip): CompactLogix native default connection size matches libplctag's Large Forward Open (found by T21 latency harness)

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Joseph Doherty
2026-10-07 19:34:30 -04:00
parent 2dc55ecb8f
commit c306c6f674
9 changed files with 101 additions and 22 deletions
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docs/drivers/AbCip.md
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@@ -115,7 +115,10 @@ The driver has two interchangeable wire transports, selected by one `DriverConfi
- **Forward Open throttle:** at most one attempt in flight, at least 1 s between starts, bounded by the
open budget.
- `ConnectionSize` / `Timeout` are honoured per pooled connection, and the **first** driver/device to open
a given device key wins.
a given device key wins. ControlLogix, GuardLogix and (since T21) CompactLogix default to 4002, a Large
Forward Open (0x5B), the same as libplctag. A target that refuses Large gets one regular open at
min(size, 504) inside the same throttled attempt. An explicit `ConnectionSize` in the options or on the
device overrides the family default.
- **Routing:** Micro800 is connected with an empty route regardless of `UseConnectedMessaging`.
SLC500/MicroLogix/PLC-5 over this driver are direct. `logixpccc` uses UnconnectedSend; its SLC framing is
**unverified**.