Hello all:
I have use 4C and 4D services to read/write atomic data or array from/to CLX5000 successfully.Now i want to read UDT(user defined type)data.I can read a struct tag wholy to my OPC,but no idea to know the member name and the member type for OPC client to read member data within a struct tag. I have the logix5000 data access manual, and want to use 52,03 service to implement it,however, i am so stupid to understand the following doubts:
(1) Read/Write Data Fragmented Foemat Service is for what? i use this service to read a array SINT[3] BY "53 03 91 04 53 49 4e 54 01 00 02 00 00 00"(the byteoffset is 2,size is 1),the response is wrong.
(2) the "tt" (instance number) of the Get Attribute List Service command is what and where to get it?
I am so confused ,any help will be appreciated,thanks.
I have use 4C and 4D services to read/write atomic data or array from/to CLX5000 successfully.Now i want to read UDT(user defined type)data.I can read a struct tag wholy to my OPC,but no idea to know the member name and the member type for OPC client to read member data within a struct tag. I have the logix5000 data access manual, and want to use 52,03 service to implement it,however, i am so stupid to understand the following doubts:
(1) Read/Write Data Fragmented Foemat Service is for what? i use this service to read a array SINT[3] BY "53 03 91 04 53 49 4e 54 01 00 02 00 00 00"(the byteoffset is 2,size is 1),the response is wrong.
(2) the "tt" (instance number) of the Get Attribute List Service command is what and where to get it?
I am so confused ,any help will be appreciated,thanks.
