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Questions and Answers
When were Programmable Logic Controllers first developed?
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?
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?
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?
What problem did lack of standardization in PLCs create in the 1970's?
In which decade was the size of PLCs reduced?
In which decade was the size of PLCs reduced?
What improvement occurred in the 90's for PLCs?
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 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 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)?
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?
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 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?
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?
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?
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)?
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 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 role of the central processing unit (CPU) in a PLC?
What is the function of the address bus 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?
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 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 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 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 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 function of the control unit in the CPU?
What is the purpose of the address bus in a microprocessor-based system?
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?
What is the function of the control bus in a microprocessor-based system?
How is information transmitted in binary form within the PLC?
How is information transmitted in binary form within the PLC?
What type of information does the data bus carry in a microprocessor?
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 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 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 is the role of the system bus in a PLC system?
What does an 8-line address bus signify in a microprocessor-based system?
What does an 8-line address bus signify in a microprocessor-based system?
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