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Communication between Virtual PLC and LabVIEW via Modbus TCP/IP

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Hi,

I did some programs on LabVIEW which can communicate via MODBUS TCP/IP between 2 PCs. But now I would like to use a Virtual PLC which deploy a virtual IP adress. Therefore I could use my LabVIEW program to communite with this virtual PLC.

could you please advise me which Virtual PLC that I can use ?

someone here have already try it please ?

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Hi Fred,

 

There isn't really anything I can point you towards as far as compatibility with Virtual PLCs goes. Since you've worked with the API, you've probably observed that with TCP/IP you just need an IP address. My only suggestion is to give it a try. If you can reach the IP address of your device, you should be able to establish communication.

 

Thanks,

 

Peter George

Applications Engineer

National Instruments

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Hi george,

Thanks for you repply.

 

I have already try to communicate with two PCs, and it's ok.

I have another question :

If I would like to communicate with a PLC already installed. How can I have access to I/O (of PLC) from register?

 

Thnaks in advance.

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Solution
Accepted by topic author Fred19ni

The PLC software will imply a mapping of the physical/logical I/O onto the MODBUS address space.

This map will depend on the application and should be documented by the PLC progammer.

Paolo
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LV 7.1, 2011, 2017, 2019
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