Has anyone tried to use LabVIEW as a modbus slave with a PLC master?

[programmindragon]

Hello.  I use modbus extensively with PLCs as slaves.  I am finding that it might be benificial to make the PLCs be the master in my next application.  I have tried this with the MB Ethernet Example Slave.vi without any luck.  Can anyone help?

I am running LabVIEW 8.6 on Windows XP with AutomationDirect PLCs using ethernet communication.

Thank you in advance for your help.

[A_Patel]

Hi,

I think the following document will get you up and running. Ignore the RT target portion and replace it with the target as your computer:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YFeECAW&l=en-US

FLash

[programmindragon]

I forgot to mention that I do not have the IO Server addon module.  I know that this can be done with the modbus download from NI.  I have been unsuccessful as of yet so I thought someone has accomplished this already.

[A_Patel]

Hi

There are two options to connect to a Modbus device. Either the Modbus IO Servers (found in the NI LabVIEW Datalogging and Supervisory Control Module) or the free Modbus Library.

FLAsh