Podcast
Questions and Answers
What is the primary computer platform used in industrial control and automation applications?
What is the primary computer platform used in industrial control and automation applications?
- Microcontrollers
- Programmable logic controllers (PLCs) (correct)
- Mainframe computers
- Personal computers
Why were PLCs developed?
Why were PLCs developed?
- To replace microcontrollers
- To replace mainframe computers
- To provide flexibility in changing control logic (correct)
- To improve personal computers
What industry's need led to the development of PLCs?
What industry's need led to the development of PLCs?
- Telecommunications industry
- Pharmaceutical industry
- Automotive industry (correct)
- Aerospace industry
What was the problem with hard-wired relay logic panels in the automotive industry?
What was the problem with hard-wired relay logic panels in the automotive industry?
What was the desired change in the logic of I/O devices that led to the development of PLCs?
What was the desired change in the logic of I/O devices that led to the development of PLCs?
What did PLCs replace in automated factories?
What did PLCs replace in automated factories?
How are the logic functions AND and OR implemented in ladder logic diagrams?
How are the logic functions AND and OR implemented in ladder logic diagrams?
Which of the following is a standard logic in a ladder logic diagram (LLD)?
Which of the following is a standard logic in a ladder logic diagram (LLD)?
What is the purpose of a software drum in PLC programs?
What is the purpose of a software drum in PLC programs?
How is the NOT function implemented in ladder logic diagrams?
How is the NOT function implemented in ladder logic diagrams?
What is the benefit of a software drum compared to a mechanical drum?
What is the benefit of a software drum compared to a mechanical drum?
How are the discrete input channel state and the discrete output channel state represented in ladder logic diagrams?
How are the discrete input channel state and the discrete output channel state represented in ladder logic diagrams?
What type of memory can PLC memory be?
What type of memory can PLC memory be?
How many discrete I/Os can a PLC with 3 racks, 12 slots, and 16 discrete I/O in each slot support?
How many discrete I/Os can a PLC with 3 racks, 12 slots, and 16 discrete I/O in each slot support?
What is the maximum number of slots a PLC rack can have?
What is the maximum number of slots a PLC rack can have?
What is the purpose of timer and counter modules in PLCs?
What is the purpose of timer and counter modules in PLCs?
How are I/O data associated with the modules in a PLC?
How are I/O data associated with the modules in a PLC?
What type of interface is a standard hardware interface for I/O modules in PLCs?
What type of interface is a standard hardware interface for I/O modules in PLCs?
What are the three main programming languages supported by PLCs?
What are the three main programming languages supported by PLCs?
Why is Ladder logic diagrams (LLD) the most widely used language in PLCs?
Why is Ladder logic diagrams (LLD) the most widely used language in PLCs?
How do PLCs execute programs?
How do PLCs execute programs?
What does PLC ladder logic focus on?
What does PLC ladder logic focus on?
How are I/O devices connected to a common communication bus in PLCs?
How are I/O devices connected to a common communication bus in PLCs?
What type of map exists between I/O points on the hardware and CPU memory addresses in PLCs?
What type of map exists between I/O points on the hardware and CPU memory addresses in PLCs?
What is the typical software development tool for PLCs?
What is the typical software development tool for PLCs?
What are the various I/O units supported by virtually every PLC platform?
What are the various I/O units supported by virtually every PLC platform?
How are PLCs mostly programmed?
How are PLCs mostly programmed?
What is the real trend in industrial control according to the text?
What is the real trend in industrial control according to the text?
What does the PLC hardware design include?
What does the PLC hardware design include?
Why do PLCs continue to be strong in the market?
Why do PLCs continue to be strong in the market?
Flashcards are hidden until you start studying
Study Notes
Industrial Control Systems: PLCs and PC-based Control
- PLCs are widely used for large scale networking via the internet between factory PLCs and enterprise level computers.
- PLCs have a standardized rack-mounted physical shape with slots for I/O interface units and support multiple I/O racks.
- Typical software development tools for PLCs include a notebook PC, communication interface, and software development environment.
- PLCs are categorized into three to four major sizes based on I/O capabilities, CPU speed, and program functions.
- Various I/O units supported by virtually every PLC platform include digital input/output, analog input/output, high speed counter and timer, and communication modules.
- I/O modules occupy memory space in the PLC, with memory mapping used for the PLC's application program logic.
- PLCs have a modular design, rugged for harsh industrial environments, and are mostly programmed using ladder logic diagrams.
- The real trend in industrial control is the complementary use of PLCs and PC-based control, with PCs used for networking, user interface, and control logic implementation.
- PLC hardware design is based on a backplane carrying power and communication bus, with slots forming the electrical interface between I/O modules and the bus.
- The bus consists of power lines, address lines, data lines, and control lines, with the real-time kernel and user program stored in the memory.
- Claims of PLCs being replaced by PC-based control have not materialized, as PLCs continue to be strong in the market due to their modular design and ruggedness.
- The complementary use of PLCs and PCs in industrial control is the observed trend, with PCs implementing control logic and PLCs providing the I/O interface.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
