Map Allen Bradley 1400 addresses to NI Modbus addresses

[PaulNI]

Hi,

How do I map Allen Bradley 1400 Micrologix addresses like (N7:0, B3:0/1, etc., etc.) to NIs modbus addresses? Can the NI DSC module access the PLC for read/write operations without using the NI OPC server?

Is there any tutorial or URL  which specifically addresses the above queries?

Thanks in advance.

[AdnanZ]

If the PLC supports Modbus communication, you can do one of two things:

1. Either use the free NI Modbus Library for LabVIEW.

2. Use the LabVIEW DSC Module. Help for that is provided under here. There are a couple of links there to help you get started with Modbus using LabVIEW DSC.

[N\A]

It's easier if you are using OPC ... you can map and bridge data between the two protocols quickly through tags (addresses).

Here is what you need:

Modbus << OPC Data Manager >> Allen Bradley

Data Manager allows one-to-one, one-to-many, and many to many relationships between tags

Let me know if you have any questions.

Wassim Daoud

Senior OPC Architect

[PaulNI]

Thanks Wassim and Adnan. The PLC does support Modbus protocol. However, I am told that the PLC code writer should have used Modbus addresses rather than ABs standard format like N7:0, N10:1, B3:0/1  etc. Is there a way out? Sorry if I am being naive in my questions.

Thanks in advance,

Paul