It was generally more comfortable to see a cable and know that if we put EtherNet/IP, Modbus TCP, or PROFINET into one end, it was going to be available at the other end of the cable. Electromagnetic radiation from motors and other rotating equipment can interfere with wireless signals. Signals can be easily disrupted by fork trucks and other materials moving around the plant. Now, in manufacturing, sending signals through the air has always looked risky. It works the same way no matter what the material. Air or any other material, it doesn’t matter that much. Signals are injected into the conductor and recognized at another place on the conductor. Air is simply another conductor like copper wire. Today, sending signals through the air is still somewhat mysterious to most of us, but it shouldn’t be. Hertz lost that distinction, but the measurement of cycles per second is credited to Heinrich Hertz and we call it a Hertz. For a while, these waves that we now call radio were commonly called “Hertzian” waves. Much of what Marconi did was built on the work of Heinrich Hertz, who, as early as 1888, demonstrated that electromagnetic radiation could not only be generated but also detected. If you asked the average man or woman on the street about wireless communications, they would tell you it that it is an amazing feat of science to be able to send music, baseball games, and Uncle Al’s Ham Radio broadcasts through the air.Īn Italian, Guglielmo Marconi from Bologna Italy, is often credited as the inventor of the radio, but the truth is many others had done successful experiments prior to Marconi.
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