PLC Programming Methods and Applications P2

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PLC Programming Methods and Applications P2

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Ladder Diagram Fundamentals 1-5. Machine Control Terminology There are some words that are used in machine control systems that have special meanings. For safety purposes, the use of these words is explicit and can have no other meaning. They are generally used when naming control circuits, labeling switch positions on control panels, and describing modes of operation of the machine. A list of some of the more important of these terms appears below. ON This is a machine state in which power is applied to the machine and to the machine control circuits. The machine is ready to RUN. This is...

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