How do i get multiple tcp/ip modbus to work together

Hi All,
I have got a system that uses 2 identical Serial (rs-485) Modbus libraries on 2 seperate ports.
I can can put the 2 libraries on the same com port as long as I put them on different addresses.
Unfortunately the same doesn't appear to be true for TCP/IP.
The best I can do is multiple masters but only 1 slave and they all have to be on the same address.
Add a second library on a different address and it all goes bad.
Any suggestions/solutions?
iTm - Senior Systems Engineer
uses: LABVIEW 2012 SP1 x86 on Windows 7 x64. cFP, cRIO, PXI-RT

If adding as a slave, configure the master device with the IP address of the NIC that connects the LV MyComputer target to the device, and you can host multiple slaves on that same IP and separate them using the slave address (as the dialogs you posted show). So long as your master device allows you to configure the unit id.
Not sure I understand exactly what your dilemma is, but the nice thing about ModbusTCP (IMHO) is the support for multiple masters.
As you may have already suggested the serial bus address is replaced by the IP address. However, there is still a provision for including the old serial bus address for use in gateways (when many serial slaves are put 'behind' a single ModbusTCP gateway). Usually this is not even used by ModbusTCP devices, but some legacy devices still require this to be set to a certain value to work.
The NI Modbus function blocks include this in an input called the MBAP header. Within this input is the unit identifier which is the old serial bus address (I recently had to add this for a power quality meter that refused to talk unless this was set to 1).
From the detail help...
Unit Identifier—This field is for intra-system routing purposes. It typically communicates to a MODBUS serial line slave through a gateway between an Ethernet TCP-IP network and a MODBUS serial line. The MODBUS client sets this field in the request, and the server response must return this field with the same value.

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