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What is the difference between industrial Controller and prototype(Study)level controllers or Raspberry pi/Arduino Vs. Industrial Controllers(PLC, NON PLC) controllers

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    A RPi or Arduino is not a controller. What kind or purpose are you thinking about? Can you elaborate a bit what you want to know? – Helmar Jun 18 '18 at 8:28
  • I am working on industerial application for example: I have to connect many sensors near about 40 sensors are their. I have to give actuation to 3 phase motors by using these sensor readings and also such many task are their. So for this i dont want to use PLC. I have to use industrial controller. – EKNATH KULKARNI Jun 18 '18 at 8:38
  • But industrial controllers like the Siemens S7 are PLCs. It's one of the most used industrial controllers of the world. (w3.siemens.com/mcms/programmable-logic-controller/en/…) Thus, I don't get what you're asking. – Helmar Jun 18 '18 at 8:48
  • Thank you for giving me the answer of first question. I want the difference in such manner why we are not able to use prototype controllers(Arduino /pi) as industrial controllers. – EKNATH KULKARNI Jun 18 '18 at 9:19
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Industrial controllers are driven by really intense quality requirements. For example, a single controller may be responsible for a bioreactor growing a batch of culture worth $1,000,000USD to a manufacturer. Industrial controllers have to run for months and months without failure.

In contrast, prototype, hobby and study controllers such as the Raspberry Pi and Arduino are designed to support exploration and teaching. Although quality is important, it is not a primary concern. For Raspberry Pi controllers, ease of use is paramount. Raspberry Pi excels at ease of use and is a rich platform for experimentation.

Here's a specific example. Modern industrial controllers support web services for configuration, monitoring and maintenance. And when I set up my Raspberry Pi controller for aeroponics, I also use web services for the same reason. The Raspberry Pi supports many web servers and I chose NodeJS, which is based on Javascript. Javascript is an interpreted language with automatic memory management. Javascript is a wonderful language for experimentation and exploration. So is Python. But interpreted languages tend to die for mysterious reasons related to memory leaks and fragmentation. Which means my Raspberry Pi dies every now and then for mysterious reasons and has to be rebooted.

These failures that I accept for the Raspberry Pi would be unacceptable for an industrial controller. For industrial controllers, I would choose a C++ web server such as Mongoose, which is small, simple and quite robust. Now I could certainly run Mongoose on the Raspberry Pi, but Raspbian itself might not be best for industrial control. Industrial controllers tend to have custom-built and tightly managed operating systems created by Yocto

Industrial controllers are often subject to strict regulations, especially in the biotech sector, where mistakes can impact human life and welfare. Even simple things like enclosures are regulated. For example, an industrial controller enclosure is often subject to "waterproofness ratings".

Taken together, the stringent constraints on industrial controllers cost manufacturers and consumers a lot, but that cost provides high value in terms of safety and yield. Thankfully, many hobbyists are able to create controllers with equivalent functionality (but with less stringent quality) using MCUs such as Arduino and Raspberry Pi. Indeed the latter provide a fertile frontier of new ideas and techniques for all controllers.

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