Describe when an interface occurs.
What will be an ideal response?
An interface occurs when two systems come together and interact, or communicate. In the case of the PLC, the communication or interaction is between the inputs (limit switches, push buttons, sensors, and the like), outputs (coils, solenoids, lights, and so forth), and the processor. This interface happens when any input or output voltage (AC or DC) or current signal is changed to or from a low-voltage DC signal that the processor uses internally for the decision-making process.
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What do wiring diagrams show and how do they convey this information?
What will be an ideal response?
____________________ has a consistency that allows it to be applied through a zerk fitting with a grease gun.
Fill in the blank(s) with the appropriate word(s).
Determine v? in the op amp circuit in Fig. 5.97.
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What is a gas pilot light?
A) a small flame that is used to light the main burners B) an LED that indicates the burner activity C) a light that allows the technician to see inside the furnace D) the first portion of the main burner that remains on at all times