Basic PLC

Basic PLC

By Franklin Bosi

is the name given to a type of computer commonly used in commercial and industrial control applications.

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​Programmable Logic Controller

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Most common devices controlled by PLC include:

Indicator Lights,

Motors and

Solenoid Valves​

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Devices Controlled by PLC

Multiple Choice

What does PLC stands for?

• Program Logic Control

• Programmable Logic Controller

• Programming Logic Controller

• Programming Logic Control

Multiple Choice

_________ is the input device of PLC.

• Keyboard

• Sensors

• Hard disc

• Monitor

Open Ended

Cite an industry or application where PLC can be found.

 The basic elements of a PLC include input modules or points, a central processing unit (CPU), output modules or points, and a programming device. The type of the input modules or points used by a PLC depends upon the types of the input devices used. Some input modules or points respond to digital inputs, also called discrete inputs, which are either on or off. Other modules or inputs respond to analog signals.

Multiple Choice

An example of a digital device used in PLC is

• motors

• pressure sensors

• fan

• switches

Multiple Choice

the part of the PLC where inputs and outputs are connected are.

• input /output module

• memory

• Processor

• power supply

Multiple Choice

the program is written in _______________ and then transferred to the memory of PLC

• input

• Programming device

• output

• power supply

Multiple Choice

Which of the following is NOT part of basic PLC system?

• Memory

• Relay box

• Power supply

• Central Processing Unit (CPU)

Multiple Choice

What is meant by programming device in PLC?

• Platform where data is processed.

• Platform where program or control logic is written.

• Platform where incoming power supply coming in.

• Platform where input or output source is connected.

Multiple Choice

Which of the following is a basic part of the PLC

• Input Module

• CPU

• Output Module

• All of the above

Multiple Choice

What is the role of I/O modules

• The hardware responsible for interfacing real world signals with the PLC processor

• The memory address that store binary only numbers

Multiple Choice

Input modules provide an interface between ______________and_____________.

• Input connections and the CPU

• Field equipment and the CPU

• Output modules and field devices

• The CPU and output modules

Multiple Choice

What is the job of the CPU?

• Forms the interface between input field devices to the controller.

• To provide DC power to the PLC.

• Store and run the PLC software program.

• Forms the interface between output field devices to the controller.

PLC Programming Langauges

1. Ladder Logic

2. Instruction List

3. Function Chart

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Open Ended

Name another PLC Programming Language not mentioned in the previous slide.

Multiple Choice

Which amongst the following is not a PLC programming language?

• Structured text

• Ladder diagram

• Mnemonics Code

• Instruction list

• Functional Block Diagram

Multiple Choice

What is the type of PLC program we are using?

• c++ language

• Ladder diagram

• Mnemonics Code

Multiple Choice

What is this symbol called?

• Normally Close contact

• Normally Open contact

• Output coil

Multiple Choice

What is this symbol called?

• Output coil

• Normally Open contact

• Normally Closed contact

Multiple Choice

What is this symbol called?

• Output coil

• Normally Open contact

• Normally Closed contact