![]() ![]() Almost as old as the first Programmable Logic Controller, the Modicon 084, which in those days was called a PC for programmable Controller. In today’s age of Internet connectivity and Web Services, Modbus’ unconnected message and simple request-response communication structure are almost quaint. It truly is as old as the hills and has the whiskers to prove it. You might call the Modbus protocol the grandfather of industrial networking.
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