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noise_book:single_board_plc [2026/06/10 20:43] – created adminnoise_book:single_board_plc [2026/06/10 20:56] (current) – admin
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 An engineering company is hired, a microcontroller is selected, and the PLC logic is rewritten in C. The prototype works, production begins, and everything seems fine. An engineering company is hired, a microcontroller is selected, and the PLC logic is rewritten in C. The prototype works, production begins, and everything seems fine.
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 +{{ :noise_book:pcblikeplc.png?nolink |}}
  
 Then the problems start. Then the problems start.
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 If a noise event temporarily changes the state of an input or output, the next scan often corrects the problem automatically. If a noise event temporarily changes the state of an input or output, the next scan often corrects the problem automatically.
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 +{{ :noise_book:plcscan.png?nolink |}}
  
 Many embedded programmers do not write software this way. Instead, they may change an output and assume it will stay that way forever. Many embedded programmers do not write software this way. Instead, they may change an output and assume it will stay that way forever.
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 Many engineers discover that copying the PLC's logic is easy. Matching the PLC's reliability is the hard part. Many engineers discover that copying the PLC's logic is easy. Matching the PLC's reliability is the hard part.
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 +----
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 +This is one reason CUBLOC was originally developed.
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 +{{ :noise_book:cb405.png?nolink |}}
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 +If you build a custom board using a CUBLOC module, some of these challenges become much easier to manage.
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 +Because CUBLOC uses ladder logic, you keep the PLC-style scan cycle and behavior that many industrial systems rely on. This helps avoid some of the software-related issues that can appear when a PLC is replaced with a conventional microcontroller program.
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 +Field maintenance is also easier. Logic changes can often be made without redesigning hardware or rewriting large portions of firmware.
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 +However, the hardware is still your responsibility.
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 +Noise protection, surge protection, PCB layout, grounding, and power supply design must still be done correctly. A CUBLOC module can simplify the control side of the design, but it cannot compensate for poor hardware design.
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 +If you have limited experience designing industrial control hardware, getting help from an experienced PCB designer can save a great deal of time and frustration later.
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 [[index|←Noise Is My Friend]] [[index|←Noise Is My Friend]]
  
noise_book/single_board_plc.1781124200.txt.gz · Last modified: by admin

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