U11: a scalar BOOL authored over Bits[n] requested element n and decoded
"any of bits 0-7 of the reply set", so Bits[n] read Good with the subscript
ignored. A Logix BOOL array is stored as DWORDs (0xD3) and its element segment
addresses them, so the native runtime now requests DWORD n / 32 and decodes bit
n % 32 when the controller answers 0xD3 (a plain BOOL reply still decodes its
byte). libplctag exposes no type code and so cannot say which DWORD it read: a
4-byte reply for such a tag is refused BadNotSupported (warned once) instead of
publishing a wrong value as Good. Real-controller proof is a hardware gate.
Refs #737
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty
82a485e42e