Live read-only check against production CompactLogix 5069-L320ERS2 rev 34.11 presses
(Z-35162 / 10.209.70.160): every @udt/<id> template the controller returned decoded to
null, so controller-discovered UDTs never fanned out. The decoder assumed a 12-byte
header led by the member count and [info][array][offset] blocks with ';'-terminated
names; libplctag actually returns a 14-byte header (u16 id, u32 def words, u32 instance
size, u16 member count, u16 handle), [info][type][offset] blocks, and NUL-terminated
names after a 'Name;<tail>' type name. All three test builders restated the old
assumption, so the unit suite agreed with itself (the #468 trap again); they now share a
TemplateBufferBuilder pinned by real captures (CipTemplateObjectWireCaptureTests).
Discovery follow-ons that the working decoder exposed:
- STRING (and user string types, LEN DINT + DATA SINT[n]) browse as one String variable,
top-level and nested, not as a LEN/DATA folder.
- Controller-generated members (ZZZZZZZZZZ* BOOL hosts, __* AOI backing) are not browsed.
- A UDT array is not fanned out into element-free Tag.Member paths.
Joseph Doherty
3b48e05e9a