MODBUS IO Server

[samy123]

Hello,

I have a modbus IO server running on my PC, through labview.

Also, I have a Modbus slave in the network.

I am trying to send some data to and fro master/slave.

I have no trouble while reading the data points on master.

But it does not let me write data to the slave.

I get "No Known Value " in NI Distributed Systems Manager.

Whereas, I can still force these values through NI Distributed Systems Manager.

Can I please get support to fix this problem.

Thank you .

[mpinzas]

Hi samy123,

I found a solution to a very similar problem to the one you are having. I am going to attach the link of the forum, the solution is specifically on the second page and it also has a video included. It seems that several people were having issues with this.

https://forums.ni.com/t5/Instrument-Control-GPIB-Serial/MODBUS-IO-server-serial-No-Known-Values-of-S...

If you need to see the problem they were having, check the first page.

Regards!

Michael Pinzas