There are a few things to consider before you decide to use this in place of a hardware-based solution. The code uses a considerable amount of controller memory. For the first client instance about 93 KB of controller memory is used. Each additional instance uses 20 KB. Download from there and unzip the downloaded file. It is broken down by Client code or Server code. Simply go to the sample code website and search for Modbus TCP. Here’s a simple way of doing Modbus TCP communication in a Logix controller without additional hardware. There is code available on the Rockwell sample code website to serve that purpose. But what if it doesn’t require extensive communication and extra hardware was overlooked? If the application requires communication to many devices and is planned for during the hardware selection phase, a partner product is a great way to go and should be planned into the project. One of the most requested network protocols other than Ethernet/IP is communication using Modbus Transmission Control Protocol (TCP). Since Logix controllers don’t natively support TCP, usually an additional hardware module or gateway from a Rockwell Encompass partner is used.
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