Intro to PLC Questions With All & Verified
Answers
Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and
solenoids? Correct answer-Output
Field or real-world devices refer to Correct answer-all devices that are physically wired to the PLC
A PLC is basically a computer designed for use in electrical control applications. Correct answer-
True
The programming device must be connected to the controller to run the program. Correct answer-
False
The instruction set for a particular PLC lists the types of instructions supported Correct answer-
True
To operate the program, the controller is placed in ____ mode. Correct answer-run
The central processing unit: Correct answer-looks at the inputs, makes the decisions based on the
program, and sets the outputs.
The programmable controller operates in real time Correct answer-True
The ___________ is the process of reading inputs, executing the program, and setting outputs on a
continuous basis. Correct answer-scan
The scan time is the time required for one complete execution of the user program. Correct
answer-true
Basically, the function of a PLC is to: Correct answer-make logical decisions and control outputs
based on them.
When a field device contact connected to the input module closes Correct answer-a logic 1 is
recorded in the memory location of the contact with the same address.
The number of I/O points does not affect the memory size required for a PLC installation Correct
answer-False
The central processing unit: Correct answer-looks at the inputs, makes the decisions based on the
program, and sets the outputs.
When dealing with PLC memory, one K of memory represents 1024 bits. Correct answer-True
The power required to operate the logic circuits of the processor unit is typically: Correct answer-
low voltage dc.
In a PLC system, there is a physical connection between field input devices and output devices.
Correct answer-False
Answers
Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and
solenoids? Correct answer-Output
Field or real-world devices refer to Correct answer-all devices that are physically wired to the PLC
A PLC is basically a computer designed for use in electrical control applications. Correct answer-
True
The programming device must be connected to the controller to run the program. Correct answer-
False
The instruction set for a particular PLC lists the types of instructions supported Correct answer-
True
To operate the program, the controller is placed in ____ mode. Correct answer-run
The central processing unit: Correct answer-looks at the inputs, makes the decisions based on the
program, and sets the outputs.
The programmable controller operates in real time Correct answer-True
The ___________ is the process of reading inputs, executing the program, and setting outputs on a
continuous basis. Correct answer-scan
The scan time is the time required for one complete execution of the user program. Correct
answer-true
Basically, the function of a PLC is to: Correct answer-make logical decisions and control outputs
based on them.
When a field device contact connected to the input module closes Correct answer-a logic 1 is
recorded in the memory location of the contact with the same address.
The number of I/O points does not affect the memory size required for a PLC installation Correct
answer-False
The central processing unit: Correct answer-looks at the inputs, makes the decisions based on the
program, and sets the outputs.
When dealing with PLC memory, one K of memory represents 1024 bits. Correct answer-True
The power required to operate the logic circuits of the processor unit is typically: Correct answer-
low voltage dc.
In a PLC system, there is a physical connection between field input devices and output devices.
Correct answer-False
