Problems with aluminum alloy guide rails of Siemens S7-300
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When searching for problems today, I found a problem. There is a layer of insulating material on the surface of the aluminum alloy guide rail where the Siemens S7-300 is installed. I had not noticed this phenomenon before. Therefore, some CPUs and communication cards are not grounded. I hope colleagues who have not noticed this problem will quickly test it. Otherwise, it will interfere with your system or even damage your CPU and communication card.
No, the 300 guide rail is actually made of engineering plastic and coated with aluminum alloy. I originally bought an 830mm rail and sawed it into two sections for use.