University of Anbar PLC Lecture 1: Introduction and History

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When were Programmable Logic Controllers first developed?

1970's

1980's

1990's

1960's (correct)

What was the main problem with relays that led to the development of PLCs?

They were expensive

They were bulky

They were slow in operation

They were mechanical and needed frequent replacement (correct)

What improvement was made to PLCs in 1973?

Increased ways of programming PLCs

Standardization in PLCs

Reduced size

Ability to communicate between PLCs (correct)

What problem did lack of standardization in PLCs create in the 1970's?

Other problems Signup and view all the answers

In which decade was the size of PLCs reduced?

1980's Signup and view all the answers

What improvement occurred in the 90's for PLCs?

Increased collection of ways in which a PLC could be programmed Signup and view all the answers

What is the main advantage of using a microprocessor-based system instead of hardwiring each control circuit for each control situation?

Flexibility to use the same basic system for all situations Signup and view all the answers

What does a programmable logic controller (PLC) use to store instructions and implement functions such as logic, sequencing, timing, counting, and arithmetic?

Programmable memory Signup and view all the answers

What type of knowledge is required by engineers to operate a programmable logic controller (PLC)?

Limited knowledge of computers and computing languages Signup and view all the answers

Which type of devices are connected to the PLC as input and output devices in the system being controlled?

Sensors and motors/valves Signup and view all the answers

What does a controller system might be required to do in a control sequence?

Maintain some variable constant or follow some prescribed change Signup and view all the answers

What is the purpose of running a motor in a controller system?

To move an object to some position Signup and view all the answers

Why are programmable logic controllers (PLCs) designed to be operated by engineers with perhaps a limited knowledge of computers and computing languages?

To simplify the programming process for non-technical users Signup and view all the answers

What is one of the main advantages of using a programmable logic controller (PLC) in controlling machines and processes?

Ability to modify a control system and the rules used with ease Signup and view all the answers

How do input devices such as sensors and switches interact with a programmable logic controller (PLC)?

By providing signals that are monitored according to a pre-programmed set of instructions Signup and view all the answers

What characteristic allows a microprocessor-based system to control a wide variety of situations through changing instructions in the program?

Flexibility Signup and view all the answers

What is the role of the central processing unit (CPU) in a PLC?

It controls and processes all the operations within the PLC. Signup and view all the answers

What is the function of the address bus in a PLC?

Sending addresses of locations for accessing stored data Signup and view all the answers

Which bus is used for communications between the input/output ports and the input/output unit in a PLC?

System bus Signup and view all the answers

What determines the operating speed of a PLC and provides timing and synchronization for all elements in the system?

Clock frequency Signup and view all the answers

What type of signals are used to carry information within a PLC?

Digital signals Signup and view all the answers

What do engineers need to understand to operate a programmable logic controller (PLC)?

Memory and input/output circuitry Signup and view all the answers

What is the role of the arithmetic and logic unit (ALU) in the CPU?

Carrying out arithmetic operations of addition and subtraction Signup and view all the answers

What is the function of the control unit in the CPU?

Controlling the timing of operations Signup and view all the answers

What is the purpose of the address bus in a microprocessor-based system?

Carrying addresses of memory locations Signup and view all the answers

What is the function of the control bus in a microprocessor-based system?

Carrying signals used by the CPU for control Signup and view all the answers

How is information transmitted in binary form within the PLC?

In parallel along its own wire Signup and view all the answers

What type of information does the data bus carry in a microprocessor?

Data used in processing by the CPU Signup and view all the answers

What is the purpose of the address bus in a microprocessor-based system?

To carry the addresses of memory locations Signup and view all the answers

What does an 8-bit word represent in the context of a microprocessor-based system?

$2^8$ bits constituting some information Signup and view all the answers

What is the role of the system bus in a PLC system?

For communications between input/output ports and input/output unit Signup and view all the answers

What does an 8-line address bus signify in a microprocessor-based system?

$2^8$ distinct addresses possible in memory Signup and view all the answers

University of Anbar PLC Lecture 1: Introduction and History

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Questions and Answers

When were Programmable Logic Controllers first developed?

What was the main problem with relays that led to the development of PLCs?

What improvement was made to PLCs in 1973?

What problem did lack of standardization in PLCs create in the 1970's?

In which decade was the size of PLCs reduced?

What improvement occurred in the 90's for PLCs?

What is the main advantage of using a microprocessor-based system instead of hardwiring each control circuit for each control situation?

What does a programmable logic controller (PLC) use to store instructions and implement functions such as logic, sequencing, timing, counting, and arithmetic?

What type of knowledge is required by engineers to operate a programmable logic controller (PLC)?

Which type of devices are connected to the PLC as input and output devices in the system being controlled?

What does a controller system might be required to do in a control sequence?

What is the purpose of running a motor in a controller system?

Why are programmable logic controllers (PLCs) designed to be operated by engineers with perhaps a limited knowledge of computers and computing languages?

What is one of the main advantages of using a programmable logic controller (PLC) in controlling machines and processes?

How do input devices such as sensors and switches interact with a programmable logic controller (PLC)?

What characteristic allows a microprocessor-based system to control a wide variety of situations through changing instructions in the program?

What is the role of the central processing unit (CPU) in a PLC?

What is the function of the address bus in a PLC?

Which bus is used for communications between the input/output ports and the input/output unit in a PLC?

What determines the operating speed of a PLC and provides timing and synchronization for all elements in the system?

What type of signals are used to carry information within a PLC?

What do engineers need to understand to operate a programmable logic controller (PLC)?

What is the role of the arithmetic and logic unit (ALU) in the CPU?

What is the function of the control unit in the CPU?

What is the purpose of the address bus in a microprocessor-based system?

What is the function of the control bus in a microprocessor-based system?

How is information transmitted in binary form within the PLC?

What type of information does the data bus carry in a microprocessor?

What is the purpose of the address bus in a microprocessor-based system?

What does an 8-bit word represent in the context of a microprocessor-based system?

What is the role of the system bus in a PLC system?

What does an 8-line address bus signify in a microprocessor-based system?

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