Question 1

What are smart relays?

Accepted Answer

Smart relays have mini processors built in.These relays can often perform multiple timing functions and may offer the ability to control how outputs act,almost like limited PLC systems.

Question 2

Which PLC company created the PLC-5,the SLC 500,and the ControlLogix line?

Accepted Answer

A)   Allen-Bradley
B)   Bedford Associates
C)   General Electric
D)   Siemens A

Question 3

What are the three steps of a sequential scan cycle for a PLC?

Accepted Answer

The first step is to check all the inputs.For the binary inputs,if the proper amount of voltage is present,it will put a 1 in box in the memory that correlates to that terminals address.If the input is analog,it will put a group of 1s and 0s into a word's worth boxes with the corresponding address,based on the amount of voltage or current present at the terminal.The next step in the sequential scan sequence is to read the program from top to bottom,left to right.The third part of the scan cycle is to connect or disconnect output connections.If the output is digital in nature or the on/off type,a 1 in the data box for that address instructs the output module to make a connection between the designated terminal screw and the common connection.If the output is analog in nature,a specific voltage or amperage is sent to the terminal screw that matches the data in the word of data for that address.

Question 4

The __________ light,when solidly lit,indicates the processor is running normally.

Accepted Answer

A)   RUN
B)   BAT
C)   FORCE
D)   OK

Question 5

Which instruction has a DN bit?

Accepted Answer

A)   XIC
B)   OTE
C)   XIO
D)   TON

Question 6

Digital inputs have signals that are __________________.

Accepted Answer

A)   -10 to +10 V DC
B)   0 to 20 mA
C)   0 to 1 V DC
D)   0 or 1

Question 7

Which PLC company created the S5,Simatic S7,and Step 7?

Accepted Answer

A)   Bedford Associates
B)   General Electric
C)   Siemens
D)   Allen-Bradley

Question 8

What is a PAC?

Accepted Answer

The answer of What is a PAC?...

Question 9

What are the basic steps of using cell phones to control machine operation?

Accepted Answer

The answer of What are the basic steps of using...

Question 10

Which system uses G-code to control operation?

Accepted Answer

A)   Smart relays
B)   CNC
C)   PLC
D)   NC

Question 11

What are forces,and what is the concern when using them?

Accepted Answer

The answer of What are forces,and what is the concern...

Question 12

What is the difference between a contactor and a motor starter?

Accepted Answer

A)   Contactors are rated for lower amperage,same as relays.
B)   Motor starters have overload modules.
C)   Contactors do not have auxiliary contacts.
D)   There is no difference between the two.

Question 13

Which of the following is not true of HMIs?

Accepted Answer

A)   They depend on external processors as they do not have their own.
B)   Every graphical element can be interactive.
C)   We can add a keyboard interface on the screen.
D)   They are used in some teach pendants.

Question 14

What is optical isolation?

Accepted Answer

The answer of What is optical isolation?...

Question 15

Communication,PID,safety,and combination are all examples of ____________ modules.

Accepted Answer

A)   output
B)   input
C)   specialty
D)   fixed

Question 16

What was Allen-Bradley's first PLC released?

Accepted Answer

A)   Series 6
B)   Modicon 084
C)   PDQ-11
D)   Simatic S4

Question 17

In which mode does the PLC processor scan the program and manipulate data?

Accepted Answer

A)   Remote program
B)   Program
C)   Run
D)   None of these are correct

Question 18

Which of the following is not true about PLCs?

Accepted Answer

A)   They can communicate over various networks
B)   They are designed to withstand harsh industrial environments
C)   They were designed to replace relay logic
D)   None of these are correct

Question 19

Which instruction looks for a 1 in the bit box?

Accepted Answer

A)   TON
B)   XIO
C)   OTE
D)   XIC

Question 20

What was the first PLC released?

Accepted Answer

A)   Modicon 084
B)   PDQ-11
C)   Simatic S4
D)   Series 6

Exam 10: Programmable Logic Controllers Plcs and Human-Machine Interfaces Hmis