Is it possible to acquire string data from PLC through LabVIEW?

[pcs82]

Hi All,

I am using Labview 8.6 and modbus library to communicate with a Allen Bradley PLC and exchange data. the screenshot of library and its usage is attached. the operations possible right now with this library are r/w of bits and bytes. Now there is a requirement to transfer the log table inside PLC to the labview. Using the available provisions in the library, there is no method to read the PLC memory which stores the log table. So I am left with the option of copying the log table memory into input registers and reading input registes into Labview, continuing until 128K of log data is read. But this doesnt really appear neat. Is there any other way of transferring Log table data into Labview?

Is there any other forum in which I can ask this question?

Thanks.

[chrylarson]

I have used the EthernetI/P LabVIEW library to do this with a ControlLogix with Ethernet.

[pcs82]

Hi,

Could you provide more details such as what kind of data you were transferring, how did you set up this system, where is this library available etc?

[himire]

I had a project to communicate with omron plc with opc server.

 ni opc server configration window,you can config the tag with storage address you wanted.then you can connect your labview application to plc through opc server.

by this way, i can read and write most of the data type,including string.

your labview application act as the client for the opc server.

sorry for my poor english.