PLC Programming Flashcard

Front

Which of the following PLC programming languages is most commonly used due to its resemblance to electrical relay logic? Function Block Diagram (FBD), Ladder Logic (LL), Structured Text (ST), Sequential Function Chart (SFC)

Back

Ladder Logic (LL)

Front

In a PLC program, what does an "AND" operation in Ladder Logic require?

Back

Both inputs to be true

Front

Which PLC programming language is text-based and similar to Pascal or C?

Back

Structured Text (ST)

Front

A PLC program in a cargo ship uses a comparator block to check if the ballast water level is within the set range. Which programming language is best suited for this task? Options: Instruction List (IL), Structured Text (ST), Function Block Diagram (FBD), Ladder Logic (LL)

Back

Function Block Diagram (FBD)

Front

What is the primary function of a PLC alarm system?

Back

To alert operators of abnormal conditions

Front

Which type of PLC alarm is triggered when a process variable exceeds a safe limit, such as high-temperature detection?

Back

High/Low-Level Alarm

Front

A PLC alarm prevents the ship’s engine from starting unless the shaft is properly aligned. What type of alarm is this?

Back

Interlock Alarm

Front

Which of the following is NOT a best practice in PLC programming?
- Using modular design for better readability
- Avoiding documentation to keep the program confidential
- Using consistent naming conventions
- Testing programs in a simulated environment before deployment

Back

Avoiding documentation to keep the program confidential

Front

A PLC onboard a vessel is responsible for controlling the automatic fire suppression system. What is the primary benefit of integrating PLCs into this system?

Back

Improved response time and reliability

Front

Which programming language is best suited for a complex algorithm requiring loops and conditional statements? Options: Ladder Logic (LL), Instruction List (IL), Function Block Diagram (FBD), Structured Text (ST)

Back

Structured Text (ST)