AB Compact Logix Boolean Array not showing full array size in UDT

[Kevin.Herron]

Logix BOOL arrays are actually packed into DWORD arrays with nothing visible to external connections to indicate they’re actually a BOOL array.

Problem on Allen-Bradley Logix Driver array of bit

Logix boolean arrays are really DWORD arrays, where each dword supplies 32 of the booleans. Drill in deeper. Your original boolean address of somebooltag[B] translates to an OPC Item Path of somebooltag[J].K where J=B/32 and K=B%32. And no, this is not a bug. The logix processor really does tell a connected system that these are DWORDs. The only booleans that are actually reported as true booleans are stand-alone boolean tags (non-array). Even booleans within UDTs aren't "real" booleans, a…