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Alarm Management for Process Control by Douglas H. Rothenberg

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CHAPTER 1

Meet Alarm Management

If you need a new machine and don’t buy it, you pay for it anyway but never get to use it.

—Henry Ford

An An alarm is an announcement to the operator initiated by a process variable (or measurement) passing a defined limit as it approaches an undesirable or unsafe value. The announcement includes audible sounds, visual indications (e.g., flashing lights and text, background or text color changes, and other graphic or pictorial changes), and messages. The announced problem requires operator action. An alarm is a construction by which an aspect of manufacturing operation is identified and configured in a binary way to be either “in alarm” or “cleared” (i.e., not in alarm). The condition of in alarm is passed to ...

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