Why Are Control Loops Operated in Manual Mode?

Why do manufacturers automate production? Why do they spend millions each year on new equipment and software? Those questions are pretty straight forward, and the answers seem obvious. Clearly automation allows manufacturers to improve the control of complex and business-critical processes. Surely automation reduces the cost of operation by enhancing production output while reducing production-related waste. But if that’s the case, then why do staff at automated facilities choose to operate production in any mode other than “auto”?

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