Exam 26: Programming a PLC and Analog Sensing for Programmable Controllers

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The ____ command is used to start a line of logic.

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The ENT command causes an instruction to be entered into the logic of the CPU.

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Discuss the use of shielded cable in signal wiring and the noise reduction it provides.

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Shielded cable is used for the installation of signal wiring. One of the most common types uses twisted wires with a Mylar foil shield. The ground wire must be grounded if the shielding is to operate properly. This type of shielded cable can provide a noise reduction ratio of about 30,000: 1. Another type of signal cable uses a twisted pair of signal wires surrounded by a braided shield. This type of cable provides a noise reduction of about 300: 1.

Try to keep wire runs ____.

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What rules must be followed with almost all programmable logic controllers?

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____________________ is a number system that contains only eight digits, 0 through 7.

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____ is generally thought of as being electrically neutral, or zero at all points.

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When using a small programming terminal, the program must be entered in a language called ____.

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What is one common method used to construct an analog pressure sensor?

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How can CPUs differentiate between coils and contacts with respect to the timer command?

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