Stored programming system exam
38 important questions on Stored programming system exam
What knowledge and skills are essential for IEC component-related operations according to the document?
- Understanding of IEC symbols, designations, and numbering.
- Knowledge of component operation/testing.
- Ability to read circuit diagrams.
- Sensor operation and testing knowledge.
- Skills in equipment use for testing.
- Reading terminal allocations.
- Understanding PLC code operation.
What are the rules for input device placement in a relay logic diagram?
- Rule 1: Place input devices near the left corner of the rung.
- Rule 2: Only one input device near the right corner of the rung.
- Rule 3: Connect in series, parallel, or both.
- Rule 4: Output devices cannot connect in series.
- Rule 5: One device per rung in the diagram.
- Rule 6: Keep input and output devices horizontal.
What should be included in a checklist for component installation?
- Verify components are to design specs.
- Check mounting is secure.
- Ensure terminations are correct.
- Confirm connections are wired.
- Check services are correct.
- Ensure alignment with design specs.
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What are the components listed under section 3.1 for a stored program system?
- 3.1.1: ON/OFF detent switch
- 3.1.2: Start the system ON/OFF
- 3.1.3: Normally open push button
- 3.1.4: Normally open push button
- 3.1.5: Normally closed push button
- 3.1.6: Stop the automated system
- 3.1.7: Indicator lamp 220 V
- 3.1.8: Indicator lamp 48 V
How is testing and ensuring proper operation highlighted in the document?
- Use a checklist for design specification adherence.
- Align services and secure connections.
- Use markers with discretion to troubleshoot.
- Test for presence of voltages.
Describe the flow and numbering requirements for relay logic diagrams.
- Flow in relay diagrams is from left to right.
- Number and label rungs for clarity.
- Include control and interlocking modules between input/output devices.
What is required in a graphical PLC application software source code?
- Represent with pictures.
- Written PLC application software must use structured text or words.
Explain the functionalities outlined in section 3.2 related to stored program systems.
- 3.2.1: Terminal list
- 3.2.2: Connection list
- 3.2.3: Working circuit
- Identify components that may appear in the PLC source or program.
What components are preprogrammed or programmed by user application in controllers?
- Preprogrammed: Embedded controllers by the manufacturer.
- User programmed: Software within controllers via user application.
Outline the logic gates mentioned for stored programme systems L3.
- AND gate switching logic.
- OR gate switching logic.
- Latching circuit logic.
What does section 3.3 ask the reader to determine about stored program systems?
- Readers are required to determine the sequence of events managed by the PLC source or program.
Explain the flow of signal using terminals in a control panel.
- Operator panel connects to Terminal RK1.
- Control panel links to Terminal RK2.
- Signals pass through Terminal RK3.
- Correct arrow drawing adds marks.
What are four troubleshooting skills needed to troubleshoot a PLC automated application?
- Analytical thinking: Identify and resolve problems.
- Technical knowledge: Understand PLC systems and components.
- Attention to detail: Accurate diagnosis and solution implementation.
- Patience: Methodically test and re-test solutions.
What type of device is Pb2 (3.1.6)?
- Pb2 is a push button.
- It is commonly used in control panels for activating different operations.
What do the sensors monitor in temperature, pressure, and level?
- Temperature: Monitors heat or cold.
- Pressure: Monitors force exerted.
- Level: Monitors fluid height or amount.
What should a check list for compliance against a PLC task instruction include?
- Verify proper wiring connections.
- Confirm program settings match instructions.
- Ensure safety protocols are followed.
- Check for correct component installation.
- Validate all inputs/outputs functionality.
- Test system responses to task scenarios.
- Document all findings and actions.
Are the sensors in FIGURE 1 discrete or analogue type sensors?
- Discrete sensors: Detect specific states (on/off).
- Analogue sensors: Measure continuous ranges of values.
What is the function of Pb2 (3.1.7)?
- Pb2 functions as a stop button.
- It is used to halt or interrupt current processes in a system.
Differentiate between discrete and analogue signals on a conveyor.
- Discrete: Signals are in set steps or levels.
- Analogue: Continuous signals, vary smoothly with amplitude, time.
How do checking and testing differ during a PLC automated installation process?
- Checking: Verifying systems/components meet specifications and are free of errors.
- Testing: Conducting trials to ensure desired outcomes, performance, and reliability.
Draw the difference between a discrete and analogue sensor output signal.
- Discrete: Shows distinct on/off states.
- Analogue: Displays a continuous range of values.
- Use graphs to illustrate differences between signals.
Describe the functionality of ON/OFF switches in control systems.
- ON/OFF detent switch: Keeps position.
- Turn system ON/OFF: Activates/deactivates.
- Normally open push button: Closes to operate.
- Normally closed push button: Opens to stop.
What is the terminal numbering of Pb2 (3.1.8)?
- The terminal numbering for Pb2 is 13 and 14.
- These numbers are used for wiring identification.
How would you place two mechanical cat's whisker sensors for workpieces on a conveyor belt?
- Position sensors at different heights.
- Detect various sizes of workpieces.
- Use pneumatic ejection for removing workpieces.
What are the output devices for designations E1 and E2 (3.1.9)?
- E1 is designated for the green standby lamp.
- E2 is designated for the amber run lamp.
What is the common DC safe voltages used for PLC (3.1.10)?
- Typical DC safe voltages for PLC systems include 24V DC.
- These are standard for ensuring safe operations.
What type of switch is Sw1?
- Allows manual control.
List three documents derived from a pictorial or perception drawing (3.2).
- Circuit diagrams for electrical layouts.
- Wiring schematic for connections overview.
- Operation manual for functional instructions.
What is the function of Sw1 in the system?
- Manual intervention for process control.
Explain what can be determined from instructions given in a perception or pictorial drawing (3.3).
- Component placements and their interactions.
- Wiring connections associated with devices.
What type of input device is Pb1?
- Used for user commands.
What is the function of Pb1 in the system?
- Begins specific operations in the process.
Describe how the safety relay must be connected to a PLC (3.4).
- Safety relay (SR) connects with PLC through numbered terminals.
- Relays 11&12 and 21&24 ensure circuit integrity.
- Proper labeling of connections is crucial.
What is the PLC address of Pb1?
- PLC addresses link physical devices with control systems.
List three basic switching logic gates in PLC ladder programming (4.2).
- AND gate for combined conditions.
- OR gate for either condition.
- NOT gate to invert logic.
List six basic ladder design rules (4.3).
- Safety considerations for all components.
- Logical flow shown clearly.
- Consistent labeling for all devices.
- Modular design for easy modifications.
- Proper spacing for connections.
- Routine testing for functionality.
Differentiate between graphical and written application PLC source code (4.4).
- Graphical involves visual block arrangements.
- Written uses text-based coding using instructions.
Name two graphical PLC programming languages (4.5).
- Ladder Diagram (LD)
- Function Block Diagram (FBD)
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