Answer the following with reference to the process control relay ladder diagram

Question

Answer the following with reference to the process control relay ladder diagram of Figure 1-17 of this chapter: When do the pressure switch contacts close? When do the temperature switch contacts close? How are the pressure and temperature switches connected with respect to each other? Describe the two conditions under which the motor starter coil will become energized. What is the approximate value of the voltage drop across each of the following when their contacts are open? Pressure switch Temperature Switch Manual Pushbutton The programmable controller operates in real time. What does this mean?

Explanation / Answer

12. A PLC is a digital computure used for automation of industrial prosesses, like control of mechines on factory assembly lines.

PLC operates in real time means-an event taking place in the field will result in an operation

i.e output results must be produced in response to the conditions of input within a bounded time

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