Building a Modbus/RTU Network

M

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MVK

I am working on a project to devise a Modbus Network to connect an Allen-Bradley CompactLogix PLC, a Caterpiller Automatic Transfer switch (ATS) and a Caterpillar Generator to DeltaV DCS.
The DeltaV DCS has Modbus/RTU comm. card with RS-485 and now I would like to come up with a network solution that would finally have all the diagnostic information for the PLC, ATS and the Generator coming in to the DeltaV thru Modbus/RTU.

I have only one port on the Serial Comm. Card available for use on the DeltaV DCS.

The A-B PLC uses DF-1 on RS-232. The ATS and the Generator use Modbus (ASCII) on RS-485.

What would be the best way to develop this network? Please let me know your suggestions.
 
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