Programming and Logic

In ladder logic programming, what does a normally closed contact represent?

• A contact that passes power when its corresponding bit is 0

• A contact that passes power when its corresponding bit is 1

• A contact that stores energy

• A contact that delays signal transmission

What is the output of the Boolean expression (A AND B) OR (NOT A AND C) when A=1, B=0, and C=1?

• 0

• 1

• Undefined

• Neither 0 nor 1

What programming structure would you use to repeat a sequence of operations until a specific condition is met?

• If-then statement

• Case statement

• Loop structure

• Subroutine

In sequential function chart programming, what element represents a stable state where actions can be performed?

• Transition

• Step

• Action

• Branch

Which statement about structured text programming is correct?

• It is a graphical programming language

• It resembles traditional text-based programming languages

• It cannot be used with PLCs

• It is the same as ladder logic

What is a key characteristic of a PLC scan cycle?

• It processes inputs and outputs simultaneously

• It processes all logic in a non-sequential manner

• It sequentially reads inputs, executes logic, and updates outputs

• It updates outputs before reading inputs

What does the timer instruction TON represent in ladder logic?

• Timer Off Delay

• Timer On Delay

• Timer Off No delay

• Timer On Network

Which data type would be most appropriate for storing a motor speed value of 1750 RPM in a PLC?

• Boolean

• Integer

• String

• Floating-point

What data type is used to represent true or false values?

• Boolean

• Integer

• String

• Floating-point

What are sub-routines in PLC programming used for?

• Replacing the main program

• Creating reusable code segments

• Storing memory variables

• Communicating with external devices