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

Question 1

Try to keep wire runs ____.

A) as long as possible
B) high in surface area
C) near electrical noise
D) as short as possible

Answer 1

as short as possible

Question 2

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

A) Ground
B) Noise
C) Shield
D) Signal

Answer 2

Ground

Question 3

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

Answer 3

One of the most common methods is to let the pressure sensor operate a current generator that produces currents between 4 and 20 milliamperes. It is desirable for the sensor to produce a certain amount of current, instead of a certain amount of voltage, because it eliminates the problem of voltage drop on lines.

Question 4

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

Question 5

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

Question 6

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

A) Contact 1
B) Boolean
C) Ada
D) C++

Question 7

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

A) STR
B) SHF
C) AND
D) ENT

Question 8

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

Question 9

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

Question 10

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