I/O Server TCP Modbus Slave: Problem reading holding register using a Master instance

[Keplovic]

Hi!

I'm having problems reading holdin registers from a I/O server TCP Modbus Slave.

I have created the I/O server following these steps:

1- I create the Modbus Slave I/O Server

2- I choose the holding register I want to write (400001)

3- I bind this holding register to a shared variable (It's called "Error") because I want to have the value of this shared variable in the modbus server.

4- I write in the shared variable (the one named Error) and I can check in the NI Distributed System Manager that the holding register (400001) has the same value than the shared variable.

5- I try to read this holding register creating an instance of a TCP Master and I get only 0s instead of the value stored in register 400001

    I use the following configuration:

    -   Port 502

    -   IP: "localhost"

    -   Starting addresss 0

Am I missing something? Anyone know what's going on?

Thanks in advance.