Micro Controllers Vs PLCs

On the surface, microcontrollers and PLCs look like they can basically do the exact same things, right? We feed an input, a program does things, and we get an output. They work continually and quickly, acting in milliseconds and faster than a traditional computer could. Why is there such a vast price difference? Why choose the more expensive option?   Certifications Programmable Logic Controllers are nearly  custom built for their industries. There are a myriad list of testing and certification processes for these products. There are extensive engineering processes to prove “XYZ is physically impossible with this product.” This is all to meet workplace safety and keep the facility running with as little down time as possible. For example, we checked the documentation for a random PLC in our inventory, and it had the following ‘general’ certifications: IEC 60068-2-14, 60068-2-1, 60068-2-2, 60068-2-14, UL840, MIL STD 810C method 514.2, EC60068-2-6, JIS C60068-2-6, MIL STD 810C Method 516.2, IEC 60068-2-27, JIS C60068-2-27, NEMA ICS 3-304, EN 6100-4-2, EN 6100-4-3, EN6100-4-4, EN 6100-4-5, EN 6100-4-6, EN 6100-4-8, EN 55011:1998 Class A, UL508, and CE EN 61131-2. That was just the quick summary. There are further certifications when you get into everything that plugs into that PLC, all its expansion modules and accessories. Microcontrollers aren’t necessarily so heavily tested. They’re designed and produced by the same standards as the rest of the tech industry, which generally comes down to: it won’t interfere with radio […]

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