The problem is you show us only screenshot they show not all.

We don't see what you make and we have no crystal ball.

The best is:

Screenshots and the program (as a ZIP file).

That what I mean we don't see what you make because you show us not all.

By the NAI use you the ID 27, by the connection ID 0.

Try this and look if are values in VW0 and VW2.

Maybe your simulator works with Little Endian. LOGO! works with Big Endian.

sjt01

Thanks. I have moved to a static link, but still cannot alter the port so have changed the port on the Modbus device to 503.

The static connections have fixed port addresses.

Connection 1 = 502
Connection 2 = 503
Connection 3 = 504
Connection 4 = 505
Connection 5 = 506
Connection 6 = 507
Connection 7 = 508
Connection 8 = 509 

I'm sorry, but I don't see for me no more way to help you.

You wrote you sent float values, but I see in the screenshot of Modbus Poll only integer or double integer.