Programmable Logic Controllers (PLCs) - JSS3 Basic technology Past Questions and Answers - page 2
Which type of sensors are commonly used with PLCs to detect object proximity?
Temperature sensors
Proximity sensors
Motion sensors
Light sensors
What does HMI stand for in the context of PLCs?
Human machine interaction
High mechanical index
Home monitoring interface
Hydraulic machine integration
What is the primary advantage of using ladder logic in PLC programming?
It requires extensive programming knowledge
It is incompatible with other programming languages
It provides graphical representation of control circuits
It is used only in automotive industry
What role do PLCs play in improving industrial efficiency?
They increase downtime
They decrease accuracy
They optimise production processes
They reduce control flexibility
Which of the following is NOT a challenge associated with implementing PLCs in industrial settings?
Initial setup costs
Complexity in programming
Compatibility with legacy equipment
Limited applications in manufacturing
What is a Programmable Logic Controller (PLC)?
A Programmable Logic Controller (PLC) is a specialised computer used in industrial automation to control electromechanical processes such as manufacturing assembly lines, robotic devices, or any activity requiring high reliability and precision. It replaces traditional relay logic systems with faster and more flexible control methods, enhancing efficiency and accuracy in industrial operations.
What programming language is commonly used in PLCs for creating control algorithms?
Ladder logic is the primary programming language used in PLCs. It mimics the electrical relay logic diagrams traditionally used in control circuits, making it intuitive for engineers and technicians familiar with electrical systems. This graphical approach allows for easy visualisation and modification of control logic, essential for managing complex automation tasks effectively.
What are function block diagrams (FBDs) used for in PLC programming?
Function block diagrams (FBDs) in PLC programming simplify the representation of complex control tasks into interconnected function blocks. Each block performs specific logic functions, such as mathematical calculations or conditional operations. FBDs are beneficial for modular programming, allowing engineers to break down intricate control algorithms into manageable units, enhancing the clarity and maintainability of PLC code.
What practical exercises typically involve programming and operating PLCs?
Practical exercises with PLCs involve hands-on tasks such as programming PLCs to control various industrial processes or machines. Students learn to map input signals from sensors to logical conditions and output signals to actuators like motors or valves. These exercises also cover troubleshooting and optimising PLC programs, preparing students for real-world applications in industrial automation and control systems engineering.
How do PLCs integrate with Human-Machine Interfaces (HMIs) in industrial settings?
PLCs integrate seamlessly with Human-Machine Interfaces (HMIs) to provide real-time monitoring and control of industrial processes. HMIs display graphical representations of process data and allow operators to interact with PLCs through touchscreen interfaces. This integration enhances operational visibility, facilitates rapid decision-making, and improves overall system performance by enabling operators to monitor and adjust parameters directly from the production floor.