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

Which of the following is not true about PLCs? 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

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

Which system uses G-code to control operation? A) Smart relays B) CNC C) PLC D) NC

What was the first PLC released? A) Modicon 084 B) PDQ-11 C) Simatic S4 D) Series 6

What was Allen-Bradley's first PLC released? A) Series 6 B) Modicon 084 C) PDQ-11 D) Simatic S4

Which PLC company created the PLC-5,the SLC 500,and the ControlLogix line? A) Allen-Bradley B) Bedford Associates C) General Electric D) Siemens

Which PLC company created the S5,Simatic S7,and Step 7? A) Bedford Associates B) General Electric C) Siemens D) Allen-Bradley

Digital inputs have signals that are __________________. A) -10 to +10 V DC B) 0 to 20 mA C) 0 to 1 V DC D) 0 or 1

Communication,PID,safety,and combination are all examples of ____________ modules. A) output B) input C) specialty D) fixed

The __________ light,when solidly lit,indicates the processor is scanning the program normally. A) OK B) BAT C) RUN D) FORCE

The __________ light,when solidly lit,indicates the processor is running normally. A) RUN B) BAT C) FORCE D) OK

In which mode does the PLC processor scan the program and manipulate data? A) Remote program B) Program C) Run D) None of these are correct

Which instruction looks for a 1 in the bit box? A) TON B) XIO C) OTE D) XIC

Which instruction has a DN bit? A) XIC B) OTE C) XIO D) TON

Which of the following is not true of HMIs? 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.

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

What is optical isolation?

What is a PAC?

What are smart relays?

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

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