Problem on Allen-Bradley Logix Driver array of bit

Ignition
1

Hello guys,
i have a AB CPU v34 with a program with many UDT used. The problem is from Ingition gateway OPC client of OPC UA of Ignition i can't see all of elements of array of bool with 160 elements. In my case I can see only first 5 elements.
Is very strange because at same level of nidification of tags I tried to put an array of 160 elements but integer. By OPC client I can see all 160 elements.
I tried also to create a new array of bool with 160 elements and in the newest I can see only first 4 elements.
There is some limitation of nidification in AB PLC?
Obiusvully in Ignition Designar I can see only tag I can see on OPC client.
Do you have any idea to solve?

Thanks

2

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, as they are hosted in some other integer type (hidden SINTs, typically).

3 Likes
3

Thanks a lot!!! You solved my problem!
Before to ask I tried to find some documentation but I haven't find.
Thenks