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13 Cards in this Set
- Front
- Back
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The purpose of the I/O section is to operate outputs based on its interpretation of inputs.
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True |
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State two reasons for employing optical isolation.
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Separate line voltage from logic circuits
To reduce the effects of electrical noise. |
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Triacs are susceptible to "dielectric-type” breakdown if the maximum peak voltage level is exceeded.
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True |
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Briefly describe why a hardwired emergency-stop circuit is recommended for PLC installations.Select one:
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To protect personnel and equipment.
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Briefly describe the function of an interposing relay.
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Separate line voltage from logic circuits or accommodate current(loads) larger than the rating of an individual terminal or circuit.
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I/O modules are keyed to prevent unauthorized personnel from programming in the run mode.
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False |
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Which of the following are not normally sources of electrical noise?
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Indicator Lamp
Overload Heaters |
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To ensure maximum benefit of shielding, the shield of a shielded cable must be terminated and grounded on both ends.
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False |
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E-Stop refers to;
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Emergency Stop
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Electromagnetic interference (EMI) can be reduced with the proper grounding of equipment.
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True |
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Solid-state output devices tend to;
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fail in the shorted or on condition.
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List four environmental considerations when installing PLC equipment.
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Temperature
Dust Vibration Humidity |
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A screwdriver should be used to change the position of DIP switches.
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False |
