10 Questions
Explain the concept of discrete process control and provide examples of parameters and variables that are typically discrete in nature.
Discrete process control refers to control systems that operate on parameters and variables that change at discrete moments in time. Examples of discrete parameters and variables include binary values such as 0 or 1, off or on, open or closed. Examples of sensors and actuators for discrete control include limit switches, photo-detectors, timers, motors, valves, and clutches.
What are ladder logic diagrams and how are they used in discrete control systems?
Ladder logic diagrams are graphical representations of the control logic used in programmable logic controllers (PLCs). They are based on the concept of relay logic and are used to design and troubleshoot control systems in discrete manufacturing processes.
Explain the role of programmable logic controllers (PLCs) in discrete control systems.
Programmable logic controllers (PLCs) are specialized industrial computers used to control manufacturing processes and machinery. They are commonly used in discrete control systems to automate tasks such as sequencing, timing, counting, and logic operations.
How are personal computers (PCs) utilized in discrete control systems with soft logic?
Personal computers (PCs) can be utilized in discrete control systems with soft logic by running software that emulates the functionality of a traditional PLC. This allows for flexibility in control system design and can be useful for prototyping and testing control logic.
What are some examples of sensors and actuators commonly used in discrete control systems?
Examples of sensors used in discrete control systems include limit switches, contact/no contact sensors, and photo-detectors. Actuators commonly used in discrete control systems include motors, valves, and clutches.
What is discrete process control and how does it differ from continuous process control?
Discrete process control operates on parameters and variables that change at discrete moments in time, with parameters and variables typically being binary (0 or 1, off or on, open or closed, etc.). Continuous process control, on the other hand, deals with parameters and variables that change continuously over time.
Explain the function of a limit switch in a discrete control system and provide an example of its application.
A limit switch is a sensor used to detect the presence or absence of an object. An example application is in a conveyor system to detect when a product reaches the end of the line, triggering the next phase of the process.
What are the key characteristics of ladder logic diagrams in discrete control systems?
Ladder logic diagrams are graphical representations of the control logic, with contacts and coils used to represent input and output devices. They are easy to understand and are commonly used in discrete control systems.
How do personal computers (PCs) with soft logic contribute to discrete control systems?
PCs with soft logic can be used as a flexible and powerful platform for programming and controlling discrete processes, providing advanced functionality and integration with other systems.
Discuss the role of programmable logic controllers (PLCs) in discrete control systems and explain their advantages.
PLCs are specialized industrial computers used to control manufacturing processes and machinery. They offer reliability, robustness, and flexibility in programming, making them suitable for discrete control applications.
Test your knowledge of discrete control using PLCs and PCs with this quiz covering topics such as discrete process control, ladder logic diagrams, programmable logic controllers, and personal computers using soft logic. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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