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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