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This document provides an overview of programmable logic controllers (PLCs), including their history, internal components, operation, and response time. PLCs were first introduced in the late 1960s to provide a more cost-effective alternative to relay-based machine control systems. A PLC works by continuously scanning its program in three steps - checking input status, executing the program logic, and updating outputs. The scan time determines the maximum response time, as an input may not be detected until

Author
rajseraj
Language
EN

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